PRELIMINARYTECHNICAL DATA
8-Channel, 1.5 MSPS, 12- & 10-Bit
a
Parallel ADCs with a Sequencer
AD7936/AD7935
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Fast Throughput Rate: 1.5 MSPS
Specified for VDD of 2.7 V to 5.25 V
Low Power:
VDD
AGND
AD7936/AD7935
V
V
/
REFIN
REFOUT
8 mW max at 1.5 MSPS with 3V Supplies
16 mW max at 1.5 MSPS with 5V Supplies
8 Analog Input Channels with a Sequencer
Software Configurable Analog Inputs:
8-Channel Single Ended Inputs
4-Channel Fully Differential Inputs
4-Channel Pseudo Differential Inputs
7-Channel Pseudo Differential Inputs
Accurate On-chip 2.5 V Reference
Wide Input Bandwidth:
2.5 V
VREF
V
0
IN
12-/10-BIT
SAR ADC
AND
CLKIN
I/P
T/H
MUX
CONVST
BUSY
V
7
IN
CONTROL
SEQUENCER
70dB SNR at 50kHz Input Frequency
No Pipeline Delays
PARALLEL INTERFACE/CONTROL REGISTER
VDRIVE
High Speed Parallel Interface operating in
Byte format
Full Shutdown Mode: 1
28-Lead TSSOP Package
µA max
D0
CS RD WR
DGND
D7
W/B
GENERAL DESCRIPTION
These parts use advanced design techniques to achieve
very low power dissipation at high throughput rates. They
also feature flexible power management options.
The AD7936/AD7935 are 12- & 10-bit, high speed,
low power, successive approximation (SAR) ADCs.
The parts operate from a single 2.7 V to 5.25 V power
supply and feature throughput rates up to 1.5 MSPS.
The parts contain a low noise, wide bandwidth, differ-
ential track/hold amplifier that can handle input
frequencies up to 20MHz.
An on-chip Control register allows the user to set up dif-
ferent operating conditions including analog input range
and configuration, output coding, power management and
channel sequencing.
PRODUCT HIGHLIGHTS
The AD7936/AD7935 feature 8 analog input channels
with a channel sequencer to allow a pre-programmed
selection of channels to be converted sequentially.
These parts can operate with either Single-ended, Fully
Differential or Pseudo Differential analog inputs. The
analog input configuration is chosen by setting the rel-
evant bits in the on-chip Control Register.
1. High Throughput with Low Power Consumption
The AD7936/AD7935 offer 1.5 MSPS throughput
with 8mW power consumption at VDD = 3V.
2. Eight Analog Inputs with a Channel Sequencer.
A sequence of input channels can be selected, through
which the AD7936/AD7935 will continuously cycle and
convert on.
The conversion process and data acquisition are con-
trolled using standard control inputs allowing easy
interfacing to Microprocessors and Dsps. The input
signal is sampled on the falling edge of CONVST and
the conversion is also initiated at this point.
3. Accurate on-chip 2.5 V reference.
4. Software Configurable Analog Inputs
Single-Ended, Pseudo Differential or Fully Differential
analog inputs that are software selectable.
The AD7936/AD7935 has an accurate on-chip 2.5 V
reference that can be used as the reference source for
the analog to digital conversion. Alternatively, this pin
can be overdriven to provide an external reference in
the range 100mV to 3.5 V.
5. Single-supply Operation with VDRIVE Function.
The AD7936/AD7935 operates from a single 2.7 V to
5.25 V supply. The VDRIVE function allows the parallel
interface to connect directly to either 3V or 5 V proces
sor systems independent of VDD
.
6. No Pipeline Delay
The parts feature a standard successive-approximation
ADC with accurate control of the sampling instant via a
CONVST input and once off conversion control.
REV.PrA 03/03
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2003
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