Rainbow Electronics MAX5661 - Manual (Page 17)

MAX5661
Pin Description
PIN NAME FUNCTION
1, 3, 5, 7, 8,
10, 15–20,
29–34, 36, 38,
42, 44, 46–52,
58, 61–64
N.C. No Connection. Not internally connected.
2 OUTI DAC Current-Source Output. OUTI sources either from 0 to 20mA or from 4–20mA.
4 V DDI
DAC Current-Output Positive Supply. Connect V DDI to a power supply between +13.48V and
+40V to power the DAC current-output (OUTI) buffer. Bypass V DDI with a 0.1µF capacitor to
AGND, as close as possible to the device.
6 COMPI
OUTI Noise-Limiting Capacitor Connection. Connect a 22nF capacitor from COMPI to V DDI to
reduce transient noise at OUTI.
9 OUTI4/0
Current-Output Range Selection Input. Connect OUTI4/0 to AGND to select the 0 to 20mA OUTI
current-output range. Connect OUTI4/0 to VDDI to select the 4–20mA OUTI current-output range.
The OUTI current range can also be set by software. When using software to set the OUTI current
range, connect OUTI4/0 to AGND.
11 REF
Buffered Voltage Reference Input. Connect an external +4.096V voltage reference to REF. Bypass
REF with a 0.1µF capacitor to DACGND, as close as possible to the device. Use a 1k
Ω resistor in
series to the reference input for optimum performance.
12 DACGND
DAC Analog Ground. Connect DACGND, DACGNDS, DUTGND, and DUTGNDS together on a
low-noise ground plane with a star connection.
13 DACGNDS
DAC Analog Sense Ground. Connect DACGND, DACGNDS, DUTGND, and DUTGNDS together
on a low-noise ground plane with a star connection.
14 CNF1
Voltage/Current Configuration Input. CNF1 and CNF0 control the OUTV and OUTI outputs. See
Tables 13 and 14.
21 CNF0
Voltage/Current Configuration Input. CNF0 and CNF1 control the OUTV and OUTI outputs. See
Tables 13 and 14.
Single 16-Bit DAC with Current and Voltage
Outputs for Industrial Analog Output Modules
______________________________________________________________________________________ 17
POSITIVE FULL-SCALE VOLTAGE
vs. FULL-SCALE OUTPUT TRIM CODE
MAX5661 toc65
CODE
FULL-SCALE VOLTAGE (V)
768 512 256
12
13
11
10
9
8
7
14
6
0 1024
UNIPOLAR OR BIPOLAR MODE
NEGATIVE FULL-SCALE VOLTAGE
vs. FULL-SCALE OUTPUT TRIM CODE
MAX5661 toc66
CODE
FULL-SCALE VOLTAGE (V)
768 512 256
-8
-7
-9
-10
-11
-12
-13
-6
-14
0 1024
Typical Operating Characteristics (continued)
( Typical Operating Circuit, V
CC = +5V, C COMPI = 22nF, V DDV = V DDCORE = +15V, V SSV = -15V, V DDI = +24V, V REF = +4.096V,
V
AGND
= V
DGND
= 0V, R
SERIES
= 47Ω, OUTV loaded with 2kΩ || 100pF to AGND, OUTI loaded with 500Ω to AGND, T
A
= +25°C.)