True Bipolar Input, 12-/14-Bit,
2-Channel, Simultaneous Sampling SAR ADCs
AD7366-5/AD7367-5
Rev. B
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FEATURES
Dual 12-bit/14-bit, 2-channel ADCs
True bipolar analog inputs
Programmable input ranges
±10 V, ±5 V, 0 V to +10 V
±12 V with +3 V external reference
Throughput rate: 500 kSPS
Simultaneous conversion with read in less than 2 μs
High analog input impedance
Low current consumption
5.1 mA typical in normal mode
320 nA typical in shutdown mode
AD7366-5
72 dB SNR at 50 kHz input frequency
12-bit no missing codes
AD7367-5
76 dB SNR at 50 kHz input frequency
14-bit no missing codes
Accurate on-chip reference: 2.5 V ± 0.2%
–40°C to +85°C operation
High speed serial interface
SPI-/QSPI-/MICROWIRE-/DSP-compatible
iCMOS process technology
Available in a 24-lead TSSOP
FUNCTIONAL BLOCK DIAGRAM
12-/14-BIT
SUCCESSIVE
APPROXIMATION
ADC
D
OUT
A
OUTPUT
DRIVERS
CONTROL
LOGIC
T/H
BUF
A1
A2
MUX
REF
AD7366-5/AD7367-5
V
DRIVE
D
CAP
CC
DV
CC
BUF
D
OUT
B
OUTPUT
DRIVERS
12-/14-BIT
SUCCESSIVE
APPROXIMATION
ADC
T/H
B1
B2
AGND AGND V
SS
DGNDD
CAP
B
CS
SCLK
CNVST
BUSY
ADDR
RANGE0
RANGE1
REFSEL
MUX
DD
06842-001
Figure 1.
GENERAL DESCRIPTION
The AD7366-5/AD7367-5
1
are dual, 12-/14-bit, low power,
successive approximation analog-to-digital converters (ADCs)
that feature throughput rates up to 500 kSPS. Each device contains
two ADCs, which are both preceded by a 2-channel multiplexer,
and a low noise, wide bandwidth, track-and-hold amplifier.
The AD7366-5/AD7367-5 are fabricated on the Analog
Devices, Inc., industrial CMOS process (iCMOS®)
2
, which is
a technology platform combining the advantages of low and
high voltage CMOS. The process allows the parts to accept
high voltage bipolar signals in addition to reducing power
consumption and package size. The AD7366-5/AD7367-5 can
accept true bipolar analog input signals in the ±10 V range,
±5 V range, and 0 V to +10 V range.
1
Protected by U.S. Patent No. 6,731,232.
2
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
+30 V and operating at ±15 V supplies while allowing dramatic reductions in
power consumption and package size, and increased ac and dc performance.
The devices have an on-chip 2.5 V reference that can be disabled to
allow the use of an external reference. If a 3 V reference is applied
to the D
CAP
A and
D
CAP
B pins, the AD7366-5/AD7367-5 can
accept a true bipolar ±12 V analog input. Minimum ±12 V V
DD
and V
SS
supplies are required for the ±12 V input range.
PRODUCT HIGHLIGHTS
1. True bipolar analog input signals can be accepted, as well
as ±10 V, ±5 V, ±12 V (with external reference), and 0 V to
+10 V unipolar signals.
2. Two complete ADC functions allow simultaneous
sampling and conversion of two channels.
3. A 500 kSPS serial interface is SPI-/QSPI™-/MICROWIRE™-/
DSP-compatible.
Table 1. Related Products
Device Resolution Throughput Rate No. of Channels
AD7366 12-Bit 1 MSPS Dual, 2-channel
AD7366-5 12-Bit 500 kSPS Dual, 2-channel
AD7367 14-Bit 1 MSPS Dual, 2-channel
AD7367-5 14-Bit 500 kSPS Dual, 2-channel
