250 kSPS, 6-Channel,Simultaneous
Sampling, Bipolar 12/14/16-Bit ADC
Preliminary Technical Data
FUNCTIONAL BLOCK DIAGRAM
6 Independent ADCs
True Bipolar Analog Inputs
Pin/Software Selectable Ranges:- ±10ꢀ, ±±ꢀ
Fast throughput rate: 2±0 kSPS
Specified for ꢀCC of 4.± ꢀ to ±.± ꢀ
160mW at 2±0 kSPS with ± ꢀ supplies
Wide input bandwidth:
8± dB SNR at ±0 kHz input frequency
On-chip Reference and Reference Buffers
Parallel and Serial Interface
High speed serial interface
Standby mode: ± µA max
iCMOSTM Process Technology
64 LQFP package
Power Line Monitoring systems
Instrumentation and control systems
Multi-axis positioning systems
signals in the ±10V range and ±5V range . They contain a 2.5V
internal reference and can also accept an external reference. If a
3V external reference is applied to the VREF pin, the ADCs can
accommodate a true bipolar ±12V analog input range. VDD and
VSS supplies of ±12V are required for this ±12V input range.
The AD7658/AD7657/AD7656 contain six 12/14/16-bit, fast, low
power, successive approximation ADCs all in the one package.
The AD7658/AD7657/AD7656 core operates from a single 4.5
V to 5.5 V power supply and features throughput rates up to 250
kSPS. The parts contain low noise, wide bandwidth track-and-
hold amplifiers that can handle input frequencies up to 8 MHz.
1. Six 12/14/16-bit 250 kSPS ADCs on board.
The conversion process and data acquisition are controlled
using CONVST signals and an internal oscillator. Three
CONVST pins allow independent simultaneous sampling of the
three ADC pairs. The AD7658/AD7657/AD7656 have both a
high speed parallel and serial interface allowing the devices to
interface with microprocessors or DSPs. When in Serial
interface mode these parts have a Daisy Chain feature allowing
multiple ADCs to connect to a single serial interface. The
AD7658/AD7657/AD7656 can accommodate true bipolar input
2. Six true bipolar high impedance analog inputs.
3. The AD7658/AD7657/AD7656 feature both a parallel and
a high speed serial interface.
* Protected by U.S. Patent No. 6,731,232
iCMOSTM Process Technology
For analog systems designers within industrial/instrumentation equipment OEMs who need high performance ICs at higher-voltage levels, iCMOS is a technology platform
that enables the development of analog ICs capable of 30V and operating at +/- 15V supplies while allowing dramatic reductions in power consumption and package size, and
increased AC and DC performance.
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