SPT7720 CADEKA | Alldatasheet
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8-BIT, 200 MSPS A/D CONVER TER TECHNICAL D ATA MA Y 9, 2001 BLOCK DIA GRAM GENERAL DESCRIPTION The SPT7720 is an 8-bit, high-speed, analog-to-digital converter implemented in a 0.5 µm BiCMOS process. It utilizes a folding and interpolating architecture that pro- vides both high sample rates and low pow er. The device comes complete with a high bandwidth track-and-hold amplifier and internal voltage reference. The SPT7720 digital inputs interface directly to TTL, CMOS or positive ECL (PECL) logic. The digital outputs are user selectable in either single-channel or dual-chan- nel modes. It is a pin-compatible, direct replacement for the AD9054. The SPT7720 is available in a 44-lead TQFP surface mount package over the industrial temperature range of –40 to +85 °C. FEA TURES Pin-compatible with AD9054 High conversion rate: 200 MSPS Less than ±1/2 LSB DLE 7.16 effective number of bits (ENOB) at 70 MHz Single +5 V pow er supply Internal THA and voltage reference Low pow er: 430 mW 500 MHz full-pow er bandwidth 1 VPP input range Single or demuxed TTL output ports 44-lead TQFP APPLICA TIONS D igital sampling oscilloscopes (DSO) RGB video processing Digital communications H igh-speed instrumentation Projection display systems /MT43 /MT150 /MT81/MT117/MT97/MT110/MT116/MT105/MT122/MT101/MT114 /MT66/MT105/MT110/MT97/MT114/MT121 /MT69/MT110/MT99/MT111/MT100/MT101/MT114 /MT82/MT101/MT102/MT101/MT114/MT101/MT110/MT99/MT101 /MT67/MT104/MT97/MT110/MT110/MT101/MT108/MT32/MT65 /MT67/MT104/MT97/MT110/MT110/MT101/MT108/MT32/MT66/MT84/MT105/MT109/MT105/MT110/MT103/MT32/MT38/MT32/MT67/MT111/MT110/MT116/MT114/MT111/MT108 /MT84/MT72/MT65 /MT65/MT73/MT78 /MT65/MT73/MT78 /MT69/MT78/MT67/MT79/MT68/MT69 /MT69/MT78/MT67/MT79/MT68/MT69 /MT68/MT69/MT77/MT85/MT88/MT68/MT83/MT68/MT83 /MT68/MT65/MT55/MT32/MT150/MT32/MT68/MT65/MT48 /MT56 /MT56 /MT86/MT82/MT69/MT70/MT32/MT73/MT78 /MT86/MT82/MT69/MT70/MT32/MT79/MT85/MT84 /MT68/MT66/MT55/MT32/MT150/MT32/MT68/MT66/MT48
ABSOLUTE MAXIMUM RATINGS (Beyond which damage may occur) 1 25 °C Temperatures Supply Voltages Input Voltages Note 1. Operation at any Absolute Maximum Rating is not implied. See Electrical Specifications for proper nominal applied conditions in typical applications. ELECTRICAL SPECIFICATIONS TA=TMIN to TMAX , VDD =+5.0 V, external reference, ƒS=200 MSPS, input amplitude = –1 dBFS, unless otherwise noted TEST TEST SPT7720 PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS DC Accuracy Differential Linearity Error (DLE) +25 °C I ±0.41 ±0.75 LSB –40 °C to +85 °C V ±1.0 ±1.0 LSB Integral Linearity Error (ILE) +25 °C I ±0.56 ±1.0 LSB –40 °C to +85 °C V ±0.9 ±1.2 LSB No Missing Codes VI Guaranteed Gain Error +25 °C I ±1.06 ±1.08 %FS Gain Tempco V 0 ppm/ °C Switching Performance Encode Pulsewidth High +25 °C IV 2.125 15 ns Encode Pulsewidth Low +25 °C IV 2.125 15 ns Aperture Delay (tA) +25 °C V 0.57 ns Aperture Uncertainty (Jitter) & Noise +25 °C V 4.5 ps rms Data Sync Setup Time (tSDS ) +25 °CI V 0 n s Data Sync Hold Time (tHDS ) +25 °C IV 0.5 ns Data Sync Pulsewidth Time (tPWDS ) +25 °C IV 2.0 ns Output Valid Time (tV) IV 4.4 5.7 ns Output Prop. Delay (tPD ) IV 6.7 8.0 ns Dynamic Performance Transient Response +25 °C V 1.5 ns Overvoltage Recovery Time +25 °C V 1.5 ns Signal-to-Noise Ratio (SNR) (without harmonics) ƒIN = 19.7 MHz +25 °CV 4 7 d B ƒIN = 19.7 MHz –40 °C to +85 °CV 4 7 d B ƒIN = 70.1 MHz +25 °C I 44 46.3 dB ƒIN = 70.1 MHz –40 °C to +85 °C V 45.8 dB Signal-to-Noise Ratio and Distortion (SINAD) ƒIN = 19.7 MHz +25 °CV 4 7 d B ƒIN = 19.7 MHz –40 °C to +85 °CV 4 3 d B ƒIN = 70.1 MHz +25 °C I 43 44.9 dB ƒIN = 70.1 MHz –40 °C to +85 °C V 44.5 dB 2nd Harmonic Distortion ƒIN = 19.7 MHz +25 °CV –59 dBc ƒIN = 70.1 MHz +25 °CV –55.4 dBc 3rd Harmonic Distortion ƒIN = 19.7 MHz +25 °CV –58 dBc ƒIN = 70.1 MHz +25 °CV –56.4 dBc Total Harmonic Distortion (THD) ƒIN = 70.1 MHz +25 °CI –50.9 –46.0 dBc ƒIN = 70.1 MHz –40 to +85 °CV –48.3 dBc Effective Number of Bits (ENOB) ƒIN = 70.1 MHz +25 °C I 6.9 7.16 Bits ƒIN = 70.1 MHz –40 to +85 °C V 6.5 Bits
All electrical characteristics are subject to the following conditions: All parameters having min/max specifications are guaranteed. The Test Level column indicates the specific device testing actually performed during production and Quality Assurance inspection. Any blank section in the data column indicates that the specification is not tested at the specified condition. TEST PROCEDURE 100% production tested at the specified temperature. 100% production tested at TA = +25 °C, and sample tested at the specified temperatures. QA sample tested only at the specified temperatures. Parameter is guaranteed (but not tested) by design and characterization data. Parameter is a typical value for information purposes only. 100% production tested at TA = +25 °C. Parameter is guaranteed over specified temperature range. TEST LEVEL I II III IV V VI ELECTRICAL SPECIFICATIONS TA=TMIN to TMAX , VDD =+5.0 V, external reference, ƒS=200 MSPS, input amplitude = –1 dBFS, unless otherwise noted TEST TEST SPT7720 PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS Analog Input Input Voltage Range (differential) V ±0.5 V Compliance Range V 1.8 3.2 V Input Offset Voltage +25 °C I ±4 ±16 mV Input Offset Voltage –40 °C to +85 °C V ±8 ±19 mV Input Resistance +25 °C V 36 62 k Ω Input Capacitance V 4 pF Input Bias Current +25 °C I 11 50 µA Input Bias Current –40 °C to +85 °CV 7 5 µ A Full Power Bandwidth V 500 MHz Reference Output Voltage VI 2.4 2.5 2.6 V Temperature Coefficient V 110 ppm/ °C Differential Digital Inputs High Level Current –40 to +85 °C V 500 625 µA >1.5 V differential Low Level Current –40 to +85 °C V 500 625 µA >1.5 V differential Input Capacitance V 3 pF Differential Inputs Differential Signal Amplitude IV 400 mV High Input Voltage IV 1.5 V DD V Low Input Voltage IV 0 V DD –0.4 V Common-Mode Input Voltage IV 1.5 V Demux Input High Input Voltage VI 2.0 V DD V Low Input Voltage VI 0 0.8 V Digital Outputs High Output Voltage Source 800 µA VI 2.4 3.9 V Low Output Voltage Sink 1.6 mA VI 0.8 0.4 V Output Coding Binary Power Supply VDD Supply Current –40 to +85 °C VI 86 111 mA Power Dissipation VI 430 555 mW Power Supply Sensitivity +25 °C IV 0.005 0.015 V/V
TYPICAL PERFORMANCE CHARACTERISTICS /MT83/MT70/MT68/MT82/MT44/MT32/MT84/MT72/MT68/MT32/MT118/MT115/MT32/MT83/MT97/MT109/MT112/MT108/MT101/MT32/MT82/MT97/MT116/MT101 /MT48 /MT53/MT48 /MT49/MT48/MT48 /MT49/MT53/MT48 /MT50/MT48/MT48/MT50/MT53/MT48 /MT150/MT51/MT48 /MT150/MT52/MT48 /MT150/MT53/MT48 /MT150/MT54/MT48 /MT150/MT55/MT48 /MT83/MT97/MT109/MT112/MT108/MT101/MT32/MT82/MT97/MT116/MT101/MT32/MT40/MT77/MT83/MT80/MT83/MT41 /MT83/MT70/MT68/MT82/MT44/MT32/MT84/MT72/MT68/MT32/MT40/MT100/MT66/MT41 /MT84/MT72/MT68 /MT83/MT70/MT68/MT82/MT84/MT72/MT68 /MT83/MT70/MT68/MT82 /MT150/MT51/MT53 /MT150/MT52/MT53 /MT150/MT53/MT53 /MT150/MT54/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT118/MT115/MT32/MT83/MT97/MT109/MT112/MT108/MT101/MT32/MT82/MT97/MT116/MT101 /MT48 /MT53/MT48 /MT49/MT48/MT48 /MT49/MT53/MT48 /MT50/MT48/MT48/MT50/MT53/MT48 /MT54/MT48 /MT53/MT48 /MT52/MT48 /MT51/MT48 /MT50/MT48 /MT83/MT97/MT109/MT112/MT108/MT101/MT32/MT82/MT97/MT116/MT101/MT32/MT40/MT77/MT83/MT80/MT83/MT41 /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT40/MT100/MT66/MT41 /MT83/MT73/MT78/MT65/MT68 /MT83/MT78/MT82 /MT53/MT53 /MT52/MT53 /MT51/MT53 /MT50/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT118/MT115/MT32/MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101 /MT150/MT52/MT48/MT150/MT50/MT53/MT48 /MT53/MT48 /MT49/MT48/MT48 /MT54/MT48 /MT53/MT48 /MT52/MT48 /MT51/MT48 /MT50/MT48 /MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101/MT32/MT40/MT68/MT101/MT103/MT114/MT101/MT101/MT115/MT32/MT67/MT41 /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT40/MT100/MT66/MT41 /MT83/MT73/MT78/MT65/MT68 /MT83/MT78/MT82 /MT50/MT53 /MT55/MT53 /MT53/MT53 /MT52/MT53 /MT51/MT53 /MT50/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83 /MT84/MT72/MT68/MT32/MT118/MT115/MT32/MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101 /MT150/MT52/MT48/MT150/MT50/MT53/MT48 /MT53/MT48 /MT49/MT48/MT48 /MT150/MT51/MT48 /MT150/MT52/MT48 /MT150/MT53/MT48 /MT150/MT54/MT48 /MT150/MT55/MT48 /MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101/MT32/MT40/MT68/MT101/MT103/MT114/MT101/MT101/MT115/MT32/MT67/MT41 /MT84/MT72/MT68/MT32/MT40/MT100/MT66/MT41 /MT50/MT53 /MT55/MT53 /MT150/MT51/MT53 /MT150/MT52/MT53 /MT150/MT53/MT53 /MT150/MT54/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83 /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT118/MT115/MT32/MT86/MT68/MT68 /MT52/MT46/MT53/MT52/MT46/MT55/MT53/MT46/MT48/MT53/MT46/MT49/MT53/MT46/MT51/MT53/MT46/MT53 /MT54/MT48 /MT53/MT48 /MT52/MT48 /MT51/MT48 /MT50/MT48 /MT86/MT111/MT108/MT116/MT115 /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT40/MT100/MT66/MT41 /MT52/MT46/MT57/MT52/MT46/MT54/MT52/MT46/MT56 /MT53/MT46/MT50/MT53/MT46/MT52 /MT83/MT78/MT82 /MT83/MT73/MT78/MT65/MT68 /MT53/MT53 /MT52/MT53 /MT51/MT53 /MT50/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83 /MT150/MT51/MT48 /MT150/MT52/MT48 /MT150/MT53/MT48 /MT150/MT54/MT48 /MT150/MT55/MT48 /MT84/MT72/MT68/MT32/MT118/MT115/MT32/MT86/MT68/MT68 /MT52/MT46/MT53/MT52/MT46/MT55/MT53/MT46/MT48/MT53/MT46/MT49/MT53/MT46/MT51/MT53/MT46/MT53 /MT86/MT111/MT108/MT116/MT115 /MT84/MT72/MT68/MT32/MT40/MT100/MT66/MT41 /MT52/MT46/MT57/MT52/MT46/MT54/MT52/MT46/MT56 /MT53/MT46/MT50/MT53/MT46/MT52 /MT150/MT51/MT53 /MT150/MT52/MT53 /MT150/MT53/MT53 /MT150/MT54/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83
TYPICAL PERFORMANCE CHARACTERISTICS /MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT118/MT115/MT32/MT69/MT110/MT99/MT111/MT100/MT101/MT32/MT80/MT117/MT108/MT115/MT101/MT119/MT105/MT100/MT116/MT104 /MT54/MT48 /MT53/MT48 /MT52/MT48 /MT51/MT48 /MT50/MT48/MT83/MT78/MT82/MT44/MT32/MT83/MT73/MT78/MT65/MT68/MT32/MT40/MT100/MT66/MT41 /MT83/MT73/MT78/MT65/MT68 /MT83/MT78/MT82 /MT49/MT46/MT48/MT49/MT46/MT53 /MT50/MT46/MT48 /MT50/MT46/MT53 /MT51/MT46/MT48/MT51/MT46/MT53 /MT69/MT110/MT99/MT111/MT100/MT101/MT32/MT80/MT117/MT108/MT115/MT101/MT119/MT105/MT100/MT116/MT104/MT32/MT40/MT110/MT83/MT41 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83 /MT53/MT53 /MT52/MT53 /MT51/MT53 /MT50/MT53 /MT83/MT70/MT68/MT82/MT44/MT32/MT84/MT72/MT68/MT32/MT118/MT115/MT32/MT69/MT110/MT99/MT111/MT100/MT101/MT32/MT80/MT117/MT108/MT115/MT101/MT119/MT105/MT100/MT116/MT104 /MT150/MT51/MT48 /MT150/MT52/MT48 /MT150/MT53/MT48 /MT150/MT54/MT48 /MT150/MT55/MT48/MT83/MT70/MT68/MT82/MT44/MT32/MT84/MT72/MT68/MT32/MT40/MT100/MT66/MT41 /MT84/MT72/MT68 /MT83/MT70/MT68/MT82 /MT49/MT46/MT48/MT49/MT46/MT53 /MT50/MT46/MT48 /MT50/MT46/MT53 /MT51/MT46/MT48/MT51/MT46/MT53 /MT69/MT110/MT99/MT111/MT100/MT101/MT32/MT80/MT117/MT108/MT115/MT101/MT119/MT105/MT100/MT116/MT104/MT32/MT40/MT110/MT83/MT41 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83/MT150/MT51/MT53 /MT150/MT52/MT53 /MT150/MT53/MT53 /MT150/MT54/MT53 /MT68/MT76/MT69/MT32/MT118/MT115/MT32/MT83/MT97/MT109/MT112/MT108/MT101/MT32/MT82/MT97/MT116/MT101 /MT48/MT46/MT55 /MT48/MT46/MT49 /MT48/MT46/MT48 /MT150/MT48/MT46/MT50 /MT150/MT48/MT46/MT53/MT76/MT83/MT66 /MT150/MT48/MT46/MT51 /MT150/MT48/MT46/MT52 /MT150/MT48/MT46/MT54 /MT150/MT48/MT46/MT55 /MT150/MT48/MT46/MT49 /MT48/MT46/MT50 /MT48/MT46/MT51 /MT48/MT46/MT52 /MT48/MT46/MT53 /MT48/MT46/MT54 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT48 /MT53/MT48 /MT49/MT48/MT48 /MT49/MT53/MT48 /MT50/MT48/MT48/MT50/MT53/MT48 /MT83/MT97/MT109/MT112/MT108/MT101/MT32/MT82/MT97/MT116/MT101/MT32/MT40/MT77/MT83/MT80/MT83/MT41 /MT68/MT76/MT69/MT32/MT118/MT115/MT32/MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101 /MT48/MT46/MT55 /MT48/MT46/MT49 /MT48/MT46/MT48 /MT150/MT48/MT46/MT50 /MT150/MT48/MT46/MT53/MT76/MT83/MT66 /MT150/MT48/MT46/MT51 /MT150/MT48/MT46/MT52 /MT150/MT48/MT46/MT54 /MT150/MT48/MT46/MT55 /MT150/MT48/MT46/MT49 /MT48/MT46/MT50 /MT48/MT46/MT51 /MT48/MT46/MT52 /MT48/MT46/MT53 /MT48/MT46/MT54 /MT150/MT52/MT48/MT150/MT50/MT53/MT48/MT53 /MT48 /MT49 /MT48 /MT48 /MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101/MT32/MT40/MT68/MT101/MT103/MT114/MT101/MT101/MT115/MT32/MT67/MT41 /MT50/MT53 /MT55/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83 /MT68/MT76/MT69/MT32/MT118/MT115/MT32/MT86/MT68/MT68 /MT52/MT46/MT53/MT52/MT46/MT55/MT53/MT46/MT48/MT53/MT46/MT49/MT53/MT46/MT51/MT53/MT46/MT53 /MT48/MT46/MT55 /MT48/MT46/MT49 /MT48/MT46/MT48 /MT150/MT48/MT46/MT50 /MT150/MT48/MT46/MT53 /MT86/MT111/MT108/MT116/MT115 /MT76/MT83/MT66 /MT52/MT46/MT57/MT52/MT46/MT54/MT52/MT46/MT56 /MT53/MT46/MT50/MT53/MT46/MT52 /MT150/MT48/MT46/MT51 /MT150/MT48/MT46/MT52 /MT150/MT48/MT46/MT54 /MT150/MT48/MT46/MT55 /MT150/MT48/MT46/MT49 /MT48/MT46/MT50 /MT48/MT46/MT51 /MT48/MT46/MT52 /MT48/MT46/MT53 /MT48/MT46/MT54 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83 /MT83/MT117/MT112/MT112/MT108/MT121/MT32/MT67/MT117/MT114/MT114/MT101/MT110/MT116/MT32/MT118/MT115/MT32/MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101 /MT150/MT52/MT48/MT150/MT50/MT53/MT48 /MT53/MT48 /MT49/MT48/MT48 /MT49/MT50/MT48 /MT49/MT48/MT48 /MT56/MT48 /MT54/MT48 /MT52/MT48 /MT84/MT101/MT109/MT112/MT101/MT114/MT97/MT116/MT117/MT114/MT101/MT32/MT40/MT68/MT101/MT103/MT114/MT101/MT101/MT115/MT32/MT67/MT41 /MT83/MT117/MT112/MT112/MT108/MT121/MT32/MT67/MT117/MT114/MT114/MT101/MT110/MT116/MT32/MT40/MT109/MT65/MT41 /MT50/MT53 /MT55/MT53 /MT131/MT73/MT78/MT32/MT61/MT32/MT55/MT48/MT46/MT49/MT32/MT77/MT72/MT122 /MT131/MT83/MT32/MT61/MT32/MT50/MT48/MT48/MT32/MT77/MT83/MT80/MT83
To save on parts count, design time, and PC board real estate, the SPT7720 utilizes an internal reference. No other external components are required to implement this feature. VOLTAGE REFERENCE CIRCUIT The SPT7720 has an on-board voltage reference circuit REF ). It is 2.5 volts and is capable of driving 50 µA loads typically. The circuit is commonly used to drive the center tap of the RF transformer in fully differential applications. For single-ended applications, this output can be used to provide the level shifting required for the single-to-differen- tial converter conversion circuit. ENCODE INPUT The ENCODE input on the SPT7720 can be driven by ei- ther a single-ended or differential clock circuit and can handle TTL, PECL, and CMOS signals. When operating at high sample rates it is important to keep the pulse width of the duty signal as close to 50% as possible. For TTL/ CMOS single-ended ENCODE inputs, the rise time of the signal also becomes an important consideration. The ENCODE input is 300 Ω into a bipolar differential pair. ENCODE is internally biased to 1.5 V with a Thevenin equivalent of 5.25 kΩ . DIGITAL INPUTS The DS input is 35 Ω into one side of a differential pair. There is a two-diode clamp from DS to DS in both direc- tions. DS is biased to 1.5 V with a Thevenin equivalent of 5.25 kΩ . The DEMUX pin is input to one side of a CMOS differential pair. The other side is internally biased to 1.5 V and does not connect to the outside. DIGITAL OUTPUTS The output circuitry of the SPT7720 has been designed to be able to support two separate output modes. The demuxed (double-wide) mode supports interleaved data output. The single-channel mode is not demuxed and can support direct output at speeds up to 100 MSPS. The output format is straight binary (table I). Table I – Output Data Format Analog Input Output Code D7–D0 +FS 1111 1111 +FS – 1/2 LSB 1111 111 Ø +1/2 FS ØØØØ ØØØØ –FS + 1/2 LSB 0000 000 Ø –FS 0000 0000 Ø indicates the flickering bit between logic 0 and 1 The data output mode is set using the DEMUX input (pin 42). Table II describes the mode switching options. Table II – Output Data Modes Output Mode DEMUX Interleaved Dual Channel Output 0 Single Channel Data Output (Bank A only 100 MSPS max) 1 EVALUATION BOARD The EB7720 evaluation board is available to aid designers in demonstrating the full performance of the SPT7720. This board includes a clock driver and reset circuit, adjust- able references and common mode, a single-ended to dif- ferential input buffer and a single-ended to differential transformer (1:1). An application note (AN7720) describ- ing the operation of this board, as well as information on the testing of the SPT7720, is also available. Contact the factory for price and availability of the EB7720.
A 0.472 Typ 12.00 Typ B 0.394 Typ 10.00 Typ C 0.394 Typ 10.00 Typ D 0.472 Typ 12.00 Typ E 0.031 Typ 0.80 Typ F 0.012 0.018 0.300 0.45 G 0.053 0.057 1.35 1.45 H 0.002 0.006 0.05 0.15 I 0.018 0.030 0.450 0.750 J 0.039 Typ 1.00 Typ K 0-7 ° 0-7° /MT73/MT110/MT100/MT101/MT120 /MT65 /MT66 /MT67/MT68 /MT80/MT105/MT110/MT32/MT49 /MT69 /MT70 /MT71 /MT72 /MT73 /MT74 /MT75 PACKAGE OUTLINE 44-Lead TQFP
AIN, AIN Differential Input Pins ENCODE Differential Clock Input ENCODE VDD Pow er Supply GND Ground DA 0–DA 7 Digital Outputs, Channel A DB 0–DB 7 Digital Outputs, Channel B VREF OUT Reference Output Voltage VREF IN Reference Input Voltage, High DEMUX Format Select: LOW = Dual-Channel Mode, HIGH = Single-Channel Mode DS , DS Data Sync and Data Sync Complement – Aligns Output Channels in Dual-Channel Mode ORDERING INFORMA TION PART NUMBER TEMPERATURE RANGE PACKAGE SPT7720SIT –40 to +85 °C 44L TQFP /MT49 /MT50 /MT51 /MT52 /MT53 /MT54 /MT55 /MT56 /MT57 /MT49/MT48 /MT49/MT49 /MT49/MT50 /MT49/MT51 /MT49/MT52 /MT49/MT53 /MT49/MT54 /MT49/MT55 /MT49/MT57 /MT49/MT56 /MT50/MT48 /MT50/MT50 /MT50/MT49/MT50/MT51 /MT50/MT52 /MT50/MT53 /MT50/MT54 /MT50/MT55 /MT50/MT56 /MT50/MT57 /MT51/MT48 /MT51/MT49 /MT51/MT50 /MT51/MT51 /MT51/MT52 /MT51/MT53 /MT51/MT54 /MT51/MT55 /MT51/MT56 /MT51/MT57 /MT52/MT48 /MT52/MT49 /MT52/MT50 /MT52/MT51 /MT52/MT52 /MT69/MT78/MT67/MT79/MT68/MT69 /MT69/MT78/MT67/MT79/MT68/MT69 /MT86/MT68/MT68 /MT71/MT78/MT68 /MT86/MT68/MT68 /MT71/MT78/MT68 /MT68/MT65/MT55/MT32/MT40/MT77/MT83/MT66/MT41 /MT68/MT65/MT54 /MT68/MT65/MT53 /MT68/MT65/MT52 /MT68/MT65/MT51 /MT68/MT65/MT50 /MT68/MT65/MT49 /MT68/MT65/MT48/MT32/MT40/MT76/MT83/MT66/MT41 /MT86/MT68/MT68 /MT71/MT78/MT68 /MT71/MT78/MT68 /MT86/MT68/MT68 /MT68/MT66/MT48/MT32/MT40/MT76/MT83/MT66/MT41 /MT68/MT66/MT49 /MT68/MT66/MT50 /MT68/MT66/MT51 /MT68/MT66/MT52 /MT68/MT66/MT53 /MT68/MT66/MT55/MT32/MT40/MT77/MT83/MT66/MT41 /MT68/MT66/MT54 /MT71/MT78/MT68 /MT71/MT78/MT68 /MT71/MT78/MT68 /MT86/MT82/MT69/MT70/MT32/MT79/MT85/MT84 /MT86/MT68/MT68 /MT86/MT68/MT68 /MT86/MT68/MT68 /MT86/MT82/MT69/MT70/MT32/MT73/MT78 /MT71/MT78/MT68 /MT86/MT68/MT68 /MT65/MT73/MT78 /MT65/MT73/MT78 /MT71/MT78/MT68 /MT86/MT68/MT68 /MT68/MT69/MT77/MT85/MT88 /MT71/MT78/MT68 /MT68/MT83 /MT68/MT83 /MT83/MT80/MT84/MT55/MT55/MT50/MT48 /MT84/MT79/MT80/MT32/MT86/MT73/MT69/MT87 /MT52/MT52/MT76/MT32/MT84/MT81/MT70/MT80 PIN ASSIGNMENTS