Rainbow Electronics MAX5123 - Manual (Page 9)

MAX5122/MAX5123
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
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Analog Output Voltage. High impedance if part is in shutdown. OUT 2
Power-Down Lockout (Digital Input).
1: Normal operation.
0: Disallows shutdown (device cannot be powered down).
PDL 4
Reset Value Input (Digital Input).
1: Connect to V
DD to select midscale as the output reset value.
0: Connect to DGND to select 0V as the output reset value.
RSTVAL 3
Active-Low Chip-Select Input (Digital Input) CS 6
Serial Clock Input SCLK 8
Serial Data Input. Data is clocked in on the rising edge of SCLK. DIN 7
Reset DAC Input (Digital Input). Clears the DAC to its predetermined (RSTVAL) output state. Clearing the
DAC will cause it to exit a software shutdown state.
CLR 5
Serial Data Output DOUT 10
Power-Down Input (Digital Input). Pulling PD high when PDL = V DD places the IC into shutdown with a maxi-
mum shutdown current of 20µA.
PD 12
User-Programmable Output (Digital Output) UPO 11
Buffered Reference Output/Input. In internal reference mode, the reference buffer provides a +2.5V
(MAX5122) or +1.25V (MAX5123) nominal output, externally adjustable at REFADJ. In external reference
mode, disable the internal reference by pulling REFADJ to V
DD and applying the external reference to REF.
REF 14
PIN
Positive Power Supply. Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to AGND. V DD 16
Amplifier Inverting Sense Input (Analog Input) FB 1
FUNCTION NAME
Analog Reference Adjust Input. Bypass with a 33nF capacitor to AGND. Connect to V DD when using an
external reference.
REFADJ 15
Analog Ground AGND 13
Digital Ground DGND 9
Pin Description