Datasheet AD1674 (Analog Devices)

a
12-Bit 100 kSPS A/D Converter AD1674* FUNCTIONAL BLOCK DIAGRAM FEATURES Complete Monolithic 12-Bit 10
m
s Sampling ADC 12/8 On-Board Sample-and-Hold Amplifier CS STS A CONTROL 0 Industry Standard Pinout CE 8- and 16-Bit Microprocessor Interface
A
R/C AC and DC Specified and Tested Unipolar and Bipolar Inputs
A A
10V REF
AA AA
REF OUT CLOCK SAR 12
6
5 V,
6
10 V, 0 V–10 V, 0 V–20 V Input Ranges Commercial, Industrial and Military Temperature
A AA AA A
AGND DB11 (MSB) COMP 20k 12 DB0 (LSB) Range Grades REF IN 12 5k 10k MIL-STD-883 and SMD Compliant Versions Available
A
BIP OFF 20VIN 10k DAC 5k
A
10V IDAC IN 2.5k 5k
A
REGISTERS / 3-STATE OUTPUT BUFFERS 2.5k SHA AD1674 PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS
The AD1674 is a complete, multipurpose, 12-bit analog-to- 1. Industry Standard Pinout: The AD1674 utilizes the pinout digital converter, consisting of a user-transparent onboard established by the industry standard AD574A and AD674A. sample-and-hold amplifier (SHA), 10 volt reference, clock and 2. Integrated SHA: The AD1674 has an integrated SHA which three-state output buffers for microprocessor interface. supports the full Nyquist bandwidth of the converter. The The AD1674 is pin compatible with the industry standard SHA function is transparent to the user; no wait-states are AD574A and AD674A, but includes a sampling function while needed for SHA acquisition. delivering a faster conversion rate. The on-chip SHA has a wide 3. DC and AC Specified: In addition to traditional dc specifica- input bandwidth supporting 12-bit accuracy over the full tions, the AD1674 is also fully specified for frequency do- Nyquist bandwidth of the converter. main ac parameters such as total harmonic distortion, The AD1674 is fully specified for ac parameters (such as S/(N+D) signal-to-noise ratio and input bandwidth. These parameters ratio, THD, and IMD) and dc parameters (offset, full-scale can be tested and guaranteed as a result of the onboard error, etc.). With both ac and dc specifications, the AD1674 is SHA. ideal for use in signal processing and traditional dc measure- 4. Analog Operation: The precision, laser-trimmed scaling and ment applications. bipolar offset resistors provide four calibrated ranges: The AD1674 design is implemented using Analog Devices’ 0 V to +10 V and 0 V to +20 V unipolar, –5 V to +5 V and BiMOS II process allowing high performance bipolar analog cir- –10 V to +10 V bipolar. The AD1674 operates on +5 V and cuitry to be combined on the same die with digital CMOS logic. ±12 V or ±15 V power supplies. Five different temperature grades are available. The AD1674J 5. Flexible Digital Interface: On-chip multiple-mode and K grades are specified for operation over the 0°C to +70°C three-state output buffers and interface logic allow direct temperature range. The A and B grades are specified from connection to most microprocessors. –40°C to +85°C; the AD1674T grade is specified from –55°C to +125°C. The J and K grades are available in both 28-lead plastic DIP and SOIC. The A and B grade devices are available in 28-lead hermetically sealed ceramic DIP and 28-lead SOIC. The T grade is available in 28-lead hermetically sealed ceramic DIP.
*Protected by U. S. Patent Nos. 4,962,325; 4,250,445; 4,808,908; RE30586
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