AD7739BRUZ Datasheet, PDF (1/32 Pages) Analog Devices – 8-Channel, High Throughput, 24-Bit Sigma-Delta ADC

Data Sheet
FEATURES
High resolution ADC
24 bits, no missing codes
±0.0015% nonlinearity
Optimized for fast channel switching
18-bit p-p resolution (21 bits effective) at 500 Hz
16-bit p-p resolution (19 bits effective) at 4 kHz
On-chip per channel system calibration
Configurable inputs
8 single-ended or 4 fully differential
Input ranges
+625 mV, ±625 mV, +1.25 V, ±1.25 V, +2.5 V, ±2.5 V
3-wire serial interface
SPI®, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on logic inputs
Single-supply operation
5 V analog supply
3 V or 5 V digital supply
Package: 24-lead TSSOP
APPLICATIONS
PLCs/DCSs
Multiplexing applications
Process control
Industrial instrumentation
GENERAL DESCRIPTION
The AD7739 is a high precision, high throughput analog front
end. True 16-bit p-p resolution is achievable with a total
conversion time of 250 μs (4 kHz channel switching), making it
ideally suited to high resolution multiplexing applications.
The part can be configured via a simple digital interface, which
allows users to balance the noise performance against data
throughput up to 15 kHz.
The analog front end features eight single-ended or four fully
differential input channels with unipolar or bipolar 625 mV,
1.25 V, and 2.5 V input ranges. It accepts a common-mode
input voltage from 200 mV above AGND to AVDD − 300 mV.
The differential reference input features no-reference detect
capability. The ADC also supports per channel system
calibration options.
The digital serial interface can be configured for 3-wire
operation and is compatible with microcontrollers and digital
signal processors. All interface inputs are Schmitt triggered.
Rev. A
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8-Channel, High Throughput,
24-Bit Sigma-Delta ADC
AD7739
FUNCTIONAL BLOCK DIAGRAM
REFIN(–) REFIN(+)
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AINCOM/P0
SYNC/P1
REFERENCE
DETECT
MUX
BUFFER
24-BIT
- ADC
AD7739
DV_DD
CALIBRATION
CIRCUITRY
SERIAL
INTERFACE
AV_DD
I/O PORT
CLOCK
GENERATOR
CONTROL
LOGIC
CS
SCLK
DOUT
DIN
RESET
RDY
AGND AV_DD MCLKOUT MCLKIN DGND DV_DD
Figure 1.
03742-0-012
The part is specified for operation over the extended industrial
temperature range of –40°C to +105°C.
Other parts in the AD7739 family are the AD7738, AD7734,
and AD7732.
The AD7738 is similar to the AD7739 but has higher speed
(8.5 kHz channel switching for 16-bit performance) and higher
AIN leakage current. The AD7738 multiplexer output is pinned
out externally, allowing the user to implement programmable
gain or signal conditioning before being applied to the ADC.
The AD7734 analog front end features four single-ended input
channels with unipolar or true bipolar input ranges to ±10 V
while operating from a single +5 V analog supply. The AD7734
accepts an analog input overvoltage to ±16.5 V without
degrading the performance of the adjacent channels.
The AD7732 is similar to the AD7734, but its analog front end
features two fully differential input channels.
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