ADS804_15 TI1 | Alldatasheet
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Technical content
12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER
FEATURES
G HIGH SFDR: 80dB at NYQUIST G HIGH SNR: 69dB G LOW POWER: 180mW G LOW DLE: ±0.3LSB G FLEXIBLE INPUT RANGE G OVERRANGE INDICATOR
APPLICATIONS
G IF AND BASEBAND DIGITIZATION G CCD IMAGING G SCANNERS G TEST INSTRUMENTATION
DESCRIPTION
The ADS804 is a high-speed, high dynamic range, 12-bit, pipelined Analog-to-Digital (A/D) converter. This converter includes a high-bandwidth track-and-hold that gives excel- lent spurious performance up to and beyond the Nyquist rate. This high-bandwidth, linear track-and-hold minimizes harmonics and has low jitter, leading to excellent SNR performance. The ADS804 is also pin-compatible with the 5MHz ADS803 and the 20MHz ADS805. The ADS804 provides an internal reference and can be programmed for a 2Vp-p input range for the best spurious performance and ease of driving. Alternatively, the 5Vp-p input range can be used for the lowest input referred noise of 0.09LSBs rms giving superior imaging performance. There is also a capability to set the input range in between the 2Vp- p and 5Vp-p input ranges or to use external reference. The ADS804 also provides an over-range indicator flag to indi- cate an input range that exceeds the full-scale input range of the converter. This flag can be used to reduce the gain of the front end gain-ranging circuitry. The ADS804 employs digital error correction techniques to provide excellent differential linearity for demanding imaging applications. Its low distortion and high SNR give the extra margin needed for communications, medical imaging, video, and test instrumentation applications. The ADS804 is avail- able in a SSOP-28 package. 12-Bit Pipelined A/D Converter Core Reference and Mode Select Reference Ladder and Driver Timing Circuitry Error Correction Logic 3-State OutputsT&H D11
- •• CLK+V S ADS804 VDRV OESEL REFBVREFREFT INVIN IN (Opt.) CM OVR ADS804 SBAS068B – JANUARY 1997 – REVISED AUGUST 2002 www.ti.com PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 1997, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. ADS804E
SBAS068Bwww.ti.com NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. ABSOLUTE MAXIMUM RATINGS (1) ADS804E PARAMETER CONDITIONS MIN TYP MAX UNITS RESOLUTION 12 Bits SPECIFIED TEMPERATURE RANGE –40 to +85 °C CONVERSION CHARACTERISTICS Sample Rate 10k 10M Samples/s Data Latency 6 Clk Cycles ANALOG INPUT Single-Ended Input Range 1.5 3.5 V Single-Ended Input Range (Optional) 0 5 V Common-Mode Voltage +2.5 V Input Impedance 1.25 || 16 M Ω || pF Track-Mode Input Bandwidth –3dBFS Input 270 MHz DYNAMIC CHARACTERISTICS Differential Linearity Error (Largest Code Error) f = 500kHz ±0.3 ±0.75 LSB No Missing Codes Tested Spurious-Free Dynamic Range (1) f = 4.8MHz 73 80 dBFS 2-Tone Intermodulation Distortion(3) f = 3.5MHz and 4.0MHz (–7dBFS each tone) 76 dBc Signal-to-Noise Ratio (SNR) f = 4.8MHz 66.5 69 dBFS Signal-to-(Noise + Distortion) (SINAD) f = 4.8MHz 65 68 dBFS Effective Number of Bits at 4.8MHz(4) 11 Bits Input Referred Noise 0V to 5V Input 0.09 LSBs rms 1.5V to 3.5V Input 0.23 LSBs rms Integral Nonlinearity Error f = 500kHz ±1 ±2 LSB Aperture Delay Time 1n s Aperture Jitter 4 ps rms Over-Voltage Recovery Time 1.5 • FS Input 2 ns Full-Scale Step Acquisition Time 30 ns
ELECTRICAL CHARACTERISTICS
At TA = full specified temperature range, VS = +5V, specified input range = 1.5V to 3.5V, single-ended input, and sampling rate = 5MHz, unless otherwise specified. SPECIFIED PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT PRODUCT PACKAGE-LEAD DESIGNATOR (1) RANGE MARKING NUMBER MEDIA, QUANTITY ADS804 SSOP-28 DB –40 °C to +85°C ADS804E ADS804E Rails, 48 "" " " " ADS804E/1K Tape and Reel, 1000 NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com. PACKAGE/ORDERING INFORMATION ELECTROSTATIC DISCHARGE SENSITIVITY This integrated circuit can be damaged by ESD. Texas Instru- ments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
SBAS068B www.ti.com ELECTRICAL CHARACTERISTICS (Cont.) At TA = full specified temperature range, VS = +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 10MHz, unless otherwise specified. DIGITAL INPUTS Logic Family Convert Command Start Conversion High Level Input Current (V IN = 5V)(5) 100 µA Low Level Input Current (VIN = 0V) 10 µA High Level Input Voltage +3.5 V Low Level Input Voltage +1.0 V Input Capacitance 5p F DIGITAL OUTPUTS Logic Family Convert Command Output Voltages, V DRV = +5V Low Level I OL = 50µA +0.1 V High Level I OH = 50µA ±4.6 V Low Level I OL = 1.6mA +0.4 V High Level I OH = 0.5mA ±2.4 V Output Voltages, VDRV = +3V Low Level I OL = 50µA +0.1 V High Level I OH = 50µA +2.5 V 3-State Enable Time OE = L 20 40 ns 3-State Disable Time OE = H 2 10 ns Output Capacitance 5p F ACCURACY (5Vp-p Input Range) f S = 2.5MHz Zero Error (Referred to –FS) At 25 °C 0.2 ±1.5 %FS Zero Error Drift ±5 ppm/ °C Gain Error(6) At 25°C ±2.0 %FS Gain Error Drift(6) ±15 ppm/ °C Gain Error(7) At 25°C ±1.5 %FS Gain Error Drift(7) ±15 ppm/ °C Power-Supply Rejection of Gain ∆VS = ±5% 60 82 dB Reference Input Resistance 1.6 k Ω Internal Voltage Reference Tolerance (VREF = 2.5V) At 25 °C ±35 mV Internal Voltage Reference Tolerance (VREF = 1.0V) At 25 °C ±14 mV POWER-SUPPLY REQUIREMENTS Supply Voltage: +VS +4.7 +5.0 +5.3 V Supply Current: +IS 36 40 mA Power Dissipation 180 200 mW Thermal Resistance, θJA SSOP-28 50 °C/W NOTES: (1) Spurious-Free Dynamic Range refers to the magnitude of the largest harmonic. (2) dBFS means dB relative to full-scale. (3) 2-tone intermodulation distortion is referred to the largest fundamental tone. This number will be 6dB higher if it is referred to the magnitude of the 2-tone fundamental envelope. reference. ADS804E PARAMETER CONDITIONS MIN TYP MAX UNITS CMOS/TTL Compatible Straight Offset Binary CMOS Compatible Rising Edge of Convert Clock
SBAS068Bwww.ti.com
6 Clock Cycles
N – 6N – 5N – 4N – 3N – 2N – 1 N N + 1Data Out Clock Analog In N N + 1 N + 2 N + 3 N + 4 N + 5 N + 6 N + 7 PIN DESIGNATOR DESCRIPTION
1 OVR Over-Range Indicator (See Application
Section)
2 B1 Data Bit 1(D11) (MSB)
3 B2 Data Bit 2 (D10)
4 B3 Data Bit 3 (D9)
5 B4 Data Bit 4 (D8)
6 B5 Data Bit 5 (D7)
7 B6 Data Bit 6 (D6)
8 B7 Data Bit 7 (D5)
9 B8 Data Bit 8 (D4)
10 B9 Data Bit 9 (D3)
11 B10 Data Bit 10 (D2)
12 B11 Data Bit 11 (D1)
13 B12 Data Bit 12 (D0) (LSB)
14 CLK Convert Clock Input
15 OE Output Enable. H = High Impedance State. L = Low or floating, normal operation (Internal pull-down resistor). 16 +V S +5V Supply
17 GND Ground
18 SEL Input Range Select (See Application
Section)
19 V REF Reference Voltage Select (I/O)
20 REFB Bottom Reference
21 CM Common-Mode Voltage
22 REFT Top Reference
23 IN Analog Input ( –)
24 GND Ground
25 IN Analog Input (+)
26 GND Ground
28 VDRV Output Driver Voltage (See Application
Section) PIN CONFIGURATION PIN DESCRIPTIONS Top View SSOP TIMING DIAGRAM SYMBOL DESCRIPTION MIN TYP MAX UNITS tCONV Convert Clock Period 100 100 µsn s tL Clock Pulse LOW 48 49 ns tH Clock Pulse HIGH 48 49 ns tD Aperture Delay 2 ns t1 Data Hold Time, CL = 0pF 3.9 ns t2 New Data Delay Time, CL = 15pF max 12 ns OVR B10 B11 B12 CLK VDRV S GND IN GND IN REFT CM REFB V REF SEL GND S OE ADS804
SBAS068B www.ti.com SPECTRAL PERFORMANCE Frequency (MHz) Amplitude (dB) –20 –40 –60 –80 –100 –120 fIN = 4.8MHz SPECTRAL PERFORMANCE Frequency (MHz) Amplitude (dB) –20 –40 –60 –80 –100 –120 fIN = 500kHz INTEGRAL LINEARITY ERROR Output Code ILE (LSB) 0 1024 2048 3072 4096 4.0 2.0 –2.0 –4.0 fIN = 500kHz TYPICAL CHARACTERISTICS At TA = full specified temperature range, VS = +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 10MHz, unless otherwise specified. DIFFERENTIAL LINEARITY ERROR Output Code DLE (LSB) 0 1024 2048 3072 4096 1.0 0.5 –0.5 –1.0 fIN = 4.8MHz –20 –40 –60 –80 –100 –120 2-TONE INTERMODULATION Frequency (MHz) Magnitude (dBFSR) 0 1.25 2.5 3.75 5.0 f1 = 3.5MHz at –7dB f2 = 4MHz at –7dB IMD (3) = –76dBc 100 SWEPT POWER SFDR SFDR (dBFS, dBc) Input Amplitude (dBFS) fIN = 4.8MHz dBFS dBc
SBAS068Bwww.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = full specified temperature range, VS = +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 10MHz, unless otherwise specified. SIGNAL-TO-NOISE RATIO vs TEMPERATURE SNR (dBFS) –50 –25 0 25 50 75 100 Temperature (°C) fIN = 4.8MHz fIN = 500kHz 0.40 0.35 0.30 0.25 DIFFERENTIAL LINEARITY vs TEMPERATURE DLE (LSB) –50 –25 0 25 50 75 100 Temperature (°C) fIN = 4.8MHz fIN = 500kHz DYNAMIC PERFORMANCE vs INPUT FREQUENCY (Differential Input, VIN = 5Vp-p) SFDR, SNR (dBFS) 0.1 1 Frequency (MHz) SFDR SNR DYNAMIC PERFORMANCE vs INPUT FREQUENCY SFDR, SNR (dBFS) 0.1 1 Frequency (MHz) SNR SFDR SPURIOUS-FREE DYNAMIC RANGE vs TEMPERATURE SFDR (dBFS) –50 –25 0 25 50 75 100 Temperature (°C) fIN = 4.8MHz fIN = 500kHz SIGNAL-TO-(NOISE + DISTORTION) vs TEMPERATURE SINAD (dBFS) –50 –25 0 25 50 75 100 Temperature (°C) fIN = 4.8MHz fIN = 500kHz
SBAS068B www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = full specified temperature range, VS = +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 10MHz, unless otherwise specified. 185 180 175 170 POWER DISSIPATION vs TEMPERATURE Power (mW) –50 –25 0 25 50 100 75 Temperature (°C) 800 600 400 200 OUTPUT NOISE HISTOGRAM (DC INPUT) Counts (k) N – 2N – 1 N N + 1 N + 2 Code 800 600 400 200 OUTPUT NOISE HISTOGRAM (DC Input, V IN = 5Vp-p Range) Counts (k) N – 2N – 1 N N + 1 N + 2 Code
SBAS068Bwww.ti.com
APPLICATION INFORMATION
The ADS804 allows its analog inputs to be driven either single-ended or differentially. The focus of the following discussion is on the single-ended configuration. Typically, its implementation is easier to achieve, and the rated specifica- tions for the ADS804 are characterized using the single- ended mode of operation. AC-COUPLED INPUT CONFIGURATION Given in Figure 1 is the circuit example of the most common interface configuration for the ADS804. With the V REF pin connected to the SEL pin, the full-scale input range is defined to be 2Vp-p. This signal is ac-coupled in single-ended form to the ADS804 using the low distortion voltage- feedback amplifier OPA642. As is generally necessary for single- supply components, operating the ADS804 with a full-scale input signal swing requires a level-shift of the amplifier’s zero-centered analog signal to comply with the A/D convert- ers input range requirements. Using a DC blocking capacitor between the output of the driving amplifier and the converter’s input, a simple level-shifting scheme can be implemented. In this configuration, the top and bottom references (REFT, REFB) provide an output voltage of +3V and +2V, respec- tively. Here, two resistor pairs (2 • 2kΩ ) are used to create a common-mode voltage of approximately +2.5V to bias the inputs of the ADS804 (IN, IN) to the required DC voltage. An advantage of ac-coupling is that the driving amplifier still operates with a ground-based signal swing. This will keep the distortion performance at its optimum since the signal swing stays within the linear region of the op amp and sufficient headroom to the supply rails can be maintained. Consider using the inverting gain configuration to eliminate CMR induced errors of the amplifier. The addition of a small series resistor (R S) between the output of the op amp and the input of the ADS804 will be beneficial in almost all interface configurations. This will decouple the op amp’s output from the capacitive load and avoid gain peaking, which can result in increased noise. For best spurious and distortion perfor- mance, the resistor value should be kept below 100Ω . Furthermore, the series resistor together with the 100pF capacitor establish a passive low-pass filter, limiting the bandwidth for the wideband noise thus, help improving the SNR performance. DC-COUPLED WITHOUT LEVEL SHIFT In some applications the analog input signal may already be biased at a level which complies with the selected input range and reference level of the ADS804. In this case, it is only necessary to provide an adequately low source imped- ance to the selected input, IN or IN. Always consider wideband op amps since their output impedance will stay low over a wide range of frequencies. For those applications requiring the driving amplifier to provide a signal amplification, with a gain ≥ 3, consider using the decompensated voltage feed- back op amp OPA643. DC-COUPLED WITH LEVEL SHIFT Several applications may require that the bandwidth of the signal path include DC, in which case the signal has to be DC-coupled to the A/D converter. In order to accomplish this, the interface circuit has to provide a DC-level shift. See the circuit of Figure 2 which employs an op amp, to sum the ground-centered input signal with a required DC offset. The ADS804 typically operates with a +2.5V common-mode volt- age, which is established at the center tap of the ladder and connected to the IN input of the converter. Amplifier A1 operates in inverting configuration. Here resistors R1 and R 2 set the DC-bias level for A1. Because of the op amp’s noise gain of +2V/V, assuming RF = R IN, the DC offset voltage applied to its noninverting input has to be divided down to +1.25V, resulting in a DC output voltage of +2.5V. FIGURE 1. AC-Coupled Input Configuration for 2Vp-p Input Swing and Common-Mode Voltage at +2.5V Derived from Internal
www.ti.com 10-Jun-2014 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish (6) MSL Peak Temp (3) Op Temp (°C) Device Marking (4/5) Samples ADS804E ACTIVE SSOP DB 28 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 ADS804E ADS804E/1K ACTIVE SSOP DB 28 1000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 ADS804E ADS804EG4 ACTIVE SSOP DB 28 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR -40 to 85 ADS804E ADS804U OBSOLETE SOIC DW 28 TBD Call TI Call TI -40 to 85 ADS804U/1K OBSOLETE SOIC DW 28 TBD Call TI Call TI -40 to 85 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width.
www.ti.com 10-Jun-2014 Addendum-Page 2 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) (mm) (mm) (mm) (mm) W (mm) Pin1 Quadrant PACKAGE MATERIALS INFORMATION www.ti.com 31-May-2013 Pack Materials-Page 1
*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS804E/1K SSOP DB 28 1000 367.0 367.0 38.0 PACKAGE MATERIALS INFORMATION www.ti.com 31-May-2013 Pack Materials-Page 2
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