AD7356_15 Datasheet, PDF (1/21 Pages) Analog Devices – Differential Input, Dual, Simultaneous Sampling, 5 MSPS, 12-Bit, SAR ADC

Differential Input, Dual, Simultaneous
Sampling, 5 MSPS, 12-Bit, SAR ADC
AD7356
FEATURES
Dual 12-bit SAR ADC
Simultaneous sampling
Throughput rate: 5 MSPS per channel
Specified for VDD at 2.5 V
No conversion latency
Power dissipation: 36 mW at 5 MSPS
On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C
Dual conversion with read
High speed serial interface: SPI-/QSPI™-/MICROWIRE™-/DSP-
compatible
−40°C to +125°C operation
Available in a 16-lead TSSOP
APPLICATIONS
Data acquisition systems
Motion control
I and Q demodulation
GENERAL DESCRIPTION
The AD7356¹ is a dual, 12-bit, high speed, low power, successive
approximation ADC that operates from a single 2.5 V power
supply and features throughput rates up to 5 MSPS. The part
contains two ADCs, each preceded by a low noise, wide band-
width track-and-hold circuit that can handle input frequencies
in excess of 110 MHz.
The conversion process and data acquisition use standard
control inputs allowing for easy interfacing to microprocessors
or DSPs. The input signal is sampled on the falling edge of CS;
a conversion is also initiated at this point. The conversion time
is determined by the SCLK frequency.
The AD7356 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. With a 2.5 V
supply and a 5 MSPS throughput rate, the part consumes typically
14 mA. The part also offers a flexible power/throughput rate
management option.
The analog input range for the part is the differential common
mode ±VREF/2. The AD7356 has an on-chip 2.048 V reference
that can be overdriven when an external reference is preferred.
The AD7356 is available in a 16-lead thin shrink small outline
package (TSSOP).
V_INA+
V_INA–
REF_A
FUNCTIONAL BLOCK DIAGRAM
V_DD
V_DRIVE
AD7356
T/H
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
SDATA_A
BUF
REF
BUF
CONTROL
LOGIC
SCLK
CS
REF_B
V_INB+
V_INB–
12-BIT
SUCCESSIVE
T/H
APPROXIMATION
ADC
SDATA_B
AGND
AGND
REFGND
Figure 1.
DGND
PRODUCT HIGHLIGHTS
1. Two Complete ADC Functions.
These functions allow simultaneous sampling and
conversion of two channels. The conversion result of both
channels is simultaneously available on separate data lines
or in succession on one data line if only one serial port is
available.
2. High Throughput with Low Power Consumption.
The AD7356 offers a 5 MSPS throughput rate with 36 mW
power consumption.
3. No Conversion Latency.
The AD7356 features two standard successive approx-
imation ADCs with accurate control of the sampling
instant via a CS input and, once off, conversion control.
Table 1. Related Devices
Generic Resolution Throughput
AD7352 12-bit
3 MSPS
AD7357 14-bit
4.2MSPS
AD7266 12-bit
2 MSPS
AD7866 12-bit
1 MSPS
AD7366 12-bit
1 MSPS
AD7367 14-bit
1 MSPS
Analog Input
Differential
Differential
Differential/single ended
Single-ended
Single-ended bipolar
Single-ended bipolar
1 _{Protected by U.S. Patent No. 6,681,332.}
Rev. A
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