The AD7870/AD7875/AD7876 is a fast, complete, 12-bit A/D converter. It consists of a track/hold amplifier, 8 ms successiveapproximation ADC, 3 V buried Zener reference and versatile interface logic. The ADC features a self-contained internal clock which is laser trimmed to guarantee accurate control of conversion time. No external clock timing components are required; the on-chip clock may he overridden by an external clock if required.
The parts offer a choice of three data output formats: a single, parallel, 12-bit word; two 8-bit bytes or serial data. Fast bus access times and standard control inputs ensure easy interfacing to modern microprocessors and digital signal processors.
All parts operate from ±5 V power supplies. The AD7870 and AD7876 accept input signal ranges of ±3 V and ±10 V, respectively, while the AD7875 accepts a unipolar 0 V to +5 V input range. The parts can convert full power signals up to 50 kHz.
The AD7870/AD7875/AD7876 feature dc accuracy specifications such as linearity, full-scale and offset error. In addition, the AD7870 and AD7875 are fully specified for dynamic performance parameters including distortion and signal-to-noise ratio.
The parts are available in a 24-pin, 0.3 inch-wide, plastic or hermetic dual-in-line package (DIP). The AD7870 and AD7875 are available in a 28-pin plastic leaded chip carrier (PLCC), while the AD7876 is available and in a 24-pin small outline (SOIC) package.
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Complete Monolithic 12-Bit ADC with: 2 s Track/Hold Amplifier 8 s A/D Converter On-Chip Reference Laser-Trimmed Clock Parallel, Byte and Serial Digital Interface72 dB SNR at 10 kHz Input Frequency (AD7870, AD7875)57 ns Data Access TimeLow Power: 60 mW typVariety of Input Ranges: 63 V for AD7870 0 V to +5 V for AD7875 610 V for AD7876
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VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
VSS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0.3 V to 7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to VDD +0.3 V
VIN to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V to +15 V
REF OUT to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VDD
Digital Inputs to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to VDD +0.3 V
Digital Outputs to DGND . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to VDD +0.3 V
Operating Temperature Range
Commercial (J, K, L Versions AD7870) . . . . . . . . . . . . . . . . . 0°C to +70°C
Commercial (K, L Versions AD7875) . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Industrial (A, B, C Versions AD7870) . . . . . . . . . . . . . . . . 25°C to +85°C
Industrial (B, C Versions AD7875/AD7876) . . . . . . . . . . . 40°C to +85°C
Extended (S, T Versions) . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . . . . . . . . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mW/°C
Post a Buying Lead
Required Field 
