ADC-208AMM

ADC-208A MURATA-PS | Alldatasheet

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Technical content

Ḥ Figure 1. ADC-208A Block Diagram

7 ENCODER

FEATURES

■ 8-bit fl ash A/D converter ■ 20MHz sampling rate ■ 10MHz full-power bandwidth ■ Sample-hold not required ■ Low power CMOS ■ +5Vdc operation ■ 1.2 Micron CMOS ■ 8-Bit latched outputs ■ Surface-mount version ■ No missing codes PRODUCT OVERVIEW The ADC-208A utilizes an advanced VLSI 1.2 micron CMOS in providing 20MHz sampling rates at 8-bits. The fl exibility of the design architecture and process delivers latch-up free operation without external components and operation over the full military range. The ADC-208A is mechanically and electri- cally equivalent to the ADC-208 Series, with the exception of the OVERFLOW (pin 13) and ENABLE (pins 11 and 12) functions. These functions are not offered on the ADC-208A. INPUT/OUTPUT CONNECTIONS Pin FUNCTION Pin FUNCTION

1 VDD 24 BIT 8 (LSB)

2 CLOCK INPUT 23 BIT 7

3 –REFERENCE 22 BIT 6

4 ANA/DIG GND (VSS) 21 BIT 5

5 ANALOG INPUT 20 REF 1/4 FS

6 REF MIDPOINT 19 VDD

7 ANALOG INPUT 18 REF 3/4 FS

8 ANA/DIG GND (VSS) 17 BIT 4

10 VDD 15 BIT 2

11 N.C. 14 BIT 1 (MSB) 12 N.C. 13 N.C. ADC-208A 8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible) MDA_ADC-208A.B01 Page 1 of 4 For full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com Technical enquiries email: data.acquisition@murata-ps.com, tel: +1 508 339 3000

PERFORMANCE MIN. TYP . MAX. UNITS Int. Linearity @ +25°C (ref. unadjusted) End-point — ±2 ±2.6 LSB Best-fi t Line — ±1.6 ±1.9 LSB Int. Linearity Over Temp. (ref. unadjusted) End-point — ±2.3 ±2.6 LSB Best-fi t Line — ±1.8 ±2.0 LSB Zero-Scale Offset — ±1 ±2 LSB (Code "0" to "1" transition) Gain Error — ±1.5 ±3 LSB Differential Gain ➂ — 2 — % Differential Phase ➂ — 1.1 — degrees Aperture Delay — 8 — ns Aperture Jitter — 50 — ps Harmonic Distortion (8MHz second order harm.) –40 –46 — dB Ref. bandwidth (See tech note 5) — 10 — MHz Power Supply Rejection — ±0.02 ±0.05 %FSR/%Vs No Missing Codes Over the operating temperature range POWER REQUIREMENTS Power Supply Range (+VDD) +3.0 +5.0 +5.5 Volts Power Supply Current +25°C — +45 +65 mA –55°C — +50 +70 mA Power Dissipation +25°C — 225 325 mW +125°C — 200 300 mW –55°C — 250 350 mW PHYSiCAL ENVIRONMENTAL Operating Temp. Range, Case: MC/LM Versions 0 — +70 °C MM/LM/QL Versions –55 — +125 °C Storage Temp. Range –65 — +150 °C Package Type DIP 24-pin ceramic DIP LCC 24-pin ceramic LCC FUNCTIONAL SPECIFICATIONS (Typical at +5V power, +25°C, 20MHz clock, +REFERENCE = +5V, –REFERENCE = ground, unless noted) ABSOLUTE MAXIMUM RATINGS ANALOG INPUT MIN. TYP . MAX. UNITS Single-Ended, Non-Isolated Input Range DC - 20MHz 0 – +5.0 Volts Analog Input Capacitance (static - Pin 5 to 7) – 20 – pF (dynamic - Pin 5 to 7) – 64 – pF Reference Ladder Resistance – 500 – Ohms Reference Input (Note 5) –0.5 – V DD +0.5 Volts DIGITAL INPUTS Logic Levels Logic "1" 3.2 — — Volts Logic "0" — — 0.8 Volts Logic Loading Logic Loading "1" — +1 +5 µA Logic Loading "0" — +1 +5 µA Clock Low Pulse Width 15 25 — nSec DIGITAL OUTPUTS Logic Levels Logic "1" 2.4 4.5 5.0 Volts Logic "0" — — 0.4 Volts Logic Loading Logic Loading "1" 4 — — mA Logic Loading "0" 4 — — mA Output Data Valid Delay From Rising Clock Edge 99% probability 5 10 15 nSec 100% probability +25°C 5 10 25 nSec –55°C to +125°C — — 40 nSec Data Output Resolution 8 — — Bits Data Coding Straight binary PERFORMANCE Sampling Rate ➁ 15 20 — MSPS Full Power Bandwidth 10 — — MHz Diff. Linearity @ +25°C (See tech note 7) Code Transitions — ±0.5 ±1.0 LSB Center of Codes — ±0.25 — LSB Diff. Linearity Over Temp. Code Transitions — ±0.5 ±1.0 LSB Center of Codes — ±0.25 — LSB Int. Linearity @ +25°C (See tech note 4)(ref. adjusted) End-point — — ±1/2 LSB Best-fi t Line — — ±1/2 LSB Int. Linearity Over Temp. (ref. adjusted) Best-fi t Line — ±1/2 ±1 LSB Footnotes: ➀ Maximum input impedance is a function of clock frequency. ➁ At full-power input. ➂ For 10-step, 40 IRE NTSC ramp test. TECHNICAL NOTES 1. The Reference ladder is fl oating with respect to VDD and may be referenced anywhere within the specifi ed limits. AC modulation of the reference voltage may also be utilized; contact DATEL for further information. 2. Clock Pulse Width – To improve performance when input signals may exceed Nyquist bandwidths, the clock duty cycle can be adjusted so that the low portion (sample mode) of the clock pulse is 15nSec wide. Reducing the sampling time period minimizes the amount the input voltage slews and prevents the comparators from saturating. 3. A full-scale input produces all "1" on the data outputs. 4. DATEL uses the conservative defi nitions when specifying Intergal Linearity (end-point) and Differential Linearity (code transition). The specifi cations using the less conservative defi nition have also been provided as a comparative specifi cation for products specifi ed this way. The process that is used to fabricate the ADC-208A eliminates the latchup phenomena that has plagued CMOS devices in the past. These converters do not require external protec- tion diodes. 6. For clock rates less than 100kHz, there may be some degradation in offset and differential nonlinearity. Performance may be improved by increasing the clock duty cycle (decreasing the time spent in the sample mode). PARAMETERS LIMITS UNITS Power Supply Voltage (VDD Pin 1, 10, 19) –0.5 to +7 Volts Digital Inputs –0.5 to +5.5 Volts Analog Input –0.5 to (+V DD +0.5) Volts Reference Inputs –0.5 to (+V DD +0.5) Volts Digital Outputs –0.5 to +5.5 Volts (short circuit protected to ground) Lead Temperature (10 sec. max.) +300 max. °C Storage Temperature –65 to +150 °C ADC-208A 8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible) MDA_ADC-208A.B01 Page 2 of 4 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com

1. Connect the converter appropriately; a typical connection circuit is shown in Figure 2.

high-frequency decoupling capacitors.

1. Zero Adjustment - Adjusting the voltage at –REFERENCE (pin 3) adjusts the offset or
2. Full Scale Adjustment - Adjusting the voltage at +REFERENCE (pin 9) adjusts the gain of

the device. Pin 9 can be tied directly to a +5V reference for operation without adjustment.

1. Integral Nonlinearity Adjustments - Provision is made for optional adjustment of Integral

Figure 2. ADC-208A Typical Connection Diagram Table 1. ADC-208A Output Code

0.250 ±0.005 (6.35) 0.050 (1.27) 0.090 Max. (2.28) 0.400 SQ. +0.010, –0.005 (10.16) 0.020 ±0.005 (0.50) Pin 1 Pin 9 Pin 21 1.250 (31.7) PIN 1 IDENTIFIER 0.500 (12.7) DATEL ADC-208A 0.020 (0.5) 0.100 (2.5) 0.050 (1.3) 0.610 (15.5) 0.190 (4.9) 0.190 (4.9) 0.38 (9.7) 01 02 01 02 01 02 AUTO ZERO SAMPLE N N DATA N+1 DATA AUTO ZERO SAMPLE N+1 AUTO ZERO SAMPLE N+2 40nSec max. 40nSec max. MODEL TEMP . RANGE PACKAGE ADC-208AMC 0°C to +70°C 24-pin DIP ADC-208AMM –55°C to +125°C ➀ 24-pin DIP ADC-208ALC 0°C to +70°C 24-pin LCC ADC-208ALM –55°C to +125°C ➁ 24-pin LCC Figure 3 Timing Diagram ➀ The ADC-208AMM-QL replaces the ADC-208MM-QL and includes DATEL QL High-Reliability Screening. ➁ The ADC-208ALM-QL replaces the ADC-208LM.

ORDERING INFORMATION

8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible) MDA_ADC-208A.B01 Page 4 of 4 Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2008 Murata Power Solutions, Inc. USA: Mansfi eld (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com 03/20/09