16 Input, 16 Output Analog I/O Port
with Integrated Amplifiers
AD5590
Offset voltage: 2.2 mV maximum
Low input bias current: 1 pA maximum
Single supply operation
Low noise: 22 nV/√Hz
Unity gain stable
Flexible serial interface
SPI-/QSPI-/MICROWIRE-/DSP-compatible
−40°C to +85°C operation
FEATURES
Input channels
12-bit successive approximation ADC
16 inputs with sequencer
Fast throughput rate: 1 MSPS
Wide input bandwidth: 70 dB SNR at fIN = 50 kHz
Output channels
16 outputs with 12-bit DACs
On-chip 2.5 V reference
APPLICATIONS
Hardware LDAC and LDAC override function
CLR function to programmable code
Rail-to-rail operation
Optical line cards
Base stations
General-purpose analog I/O
Monitoring and control
Operational amplifiers
FUNCTIONAL BLOCK DIAGRAM
V
REFIN1/VREFOUT1
V1– V2–
ADCVDD DACVDD (×2)
V1+ V2+
POWER-ON
RESET
POWER-DOWN
LOGIC
1.25V/2.5V
REF
LDAC
BUFFER
DAC
STRING
DAC 0
INPUT
VOUT0
VOUT7
DSCLK
DSYNC1
DSYNC2
DDIN
REGISTER
REGISTER
BUFFER
DAC
REGISTER
STRING
DAC 7
INPUT
REGISTER
DAC
INTERFACE
LOGIC
LDAC
BUFFER
BUFFER
CLR
DAC
STRING
DAC 8
INPUT
VOUT8
REGISTER
REGISTER
DAC
REGISTER
STRING
DAC 15
INPUT
REGISTER
VOUT15
POWER-DOWN
LOGIC
1.25V/2.5V
REF
VDRIVE
V
REFIN2/VREFOUT2
VIN0
ASCLK
ASYNC
SEQUENCER
ADC
INTERFACE
LOGIC
12-BIT
INPUT
MUX
SUCCESSIVE
APPROXIMATION
ADC
ADIN
T/H
ADOUT
VINI5
AD5590
V
REFA
IN7(–) IN7(+)
OUT7
IN0(–) IN0(+)
OUT0
DACGND (×2)
ADCGND
Figure 1.
Rev. 0
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