AD7609 Datasheet, PDF (1/36 Pages) Analog Devices – 8-Channel Differential DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC

Data Sheet
8-Channel Differential DAS with 18-Bit,
Bipolar, Simultaneous Sampling ADC
AD7609
FEATURES
8 simultaneously sampled inputs
True differential inputs
True bipolar analog input ranges: ±10 V, ±5 V
Single 5 V analog supply and 2.3 V to 5.25 V VDRIVE
Fully integrated data acquisition solution
Analog input clamp protection
Input buffer with 1 MΩ analog input impedance
Second-order antialiasing analog filter
On-chip accurate reference and reference buffer
18-bit ADC with 200 kSPS on all channels
Oversampling capability with digital filter
Flexible parallel/serial interface
SPI/QSPI™/MICROWIRE™/DSP compatible
Performance
7 kV ESD rating on analog input channels
98 dB SNR, −107 dB THD
Dynamic range: up to 105 dB typical
Low power: 100 mW
Standby mode: 25 mW
64-lead LQFP package
APPLICATIONS
Power line monitoring and protection systems
Multiphase motor control
Instrumentation and control systems
Multiaxis positioning systems
Data acquisition systems (DAS)
COMPANION PRODUCTS
External References: ADR421, ADR431
Digital Isolators: ADuM1402, ADuM5000, ADuM5402
Power: ADIsimPower, Supervisor Parametric Search
Additional companion products on the AD7609 product page
Table 1. High Resolution, Bipolar Input, Simultaneous
Sampling DAS Solutions
Resolution
Single-
Ended
Inputs
True
Number of
Differential Simultaneous
Inputs
Sampling Channels
18 Bits
AD7608
AD7609¹
8
16 Bits
AD7606
8
AD7606-6
6
AD7606-4
4
14 Bits
AD7607
8
1 _{Patent pending.}
FUNCTIONAL BLOCK DIAGRAM
AV_CC
AV_CC
REGCAP REGCAP REFCAPB REFCAPA
V1+
CLAMP ^1MΩ
R_FB
V1–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
V2+
CLAMP ^1MΩ
R_FB
V2–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
V3+
CLAMP ^1MΩ
R_FB
V3–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
V4+
CLAMP ^1MΩ
R_FB
V4–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
V5+
CLAMP ^1MΩ
R_FB
V5–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
V6+
CLAMP ^1MΩ
R_FB
V6–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
V7+
CLAMP ^1MΩ
R_FB
V7–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
2.5V
LDO
2.5V
LDO
2.5V
REF
8:1
MUX
SERIAL
18-BIT
SAR
DIGITAL
FILTER
PARALLEL/
SERIAL
INTERFACE
AD7609
CLK OSC
PARALLEL
V8+ CLAMP ^{1MΩ RFB}
V8–
CLAMP
1MΩ
SECOND- ^T/H
R_FB ^{ORDER LPF}
CONTROL
INPUTS
AGND
CONVST A CONVST B RESET RANGE
Figure 1.
REFIN/REFOUT
REF SELECT
AGND
OS 2
OS 1
OS 0
D_OUTA
D_OUTB
RD/SCLK
CS
PAR/SER SEL
V_DRIVE
DB[15:0]
BUSY
FRSTDATA
Rev. A
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