Rainbow Electronics MAX5177 - Manual (Page 9)

MAX5175/MAX5177
Low-Power, Serial, 12-Bit DACs with
Force/Sense Voltage Output
_______________________________________________________________________________________ 9
Pin Description
Typical Operating Characteristics (continued)
(MAX5175: V
DD
= +5V, V
REF
= 2.5V; MAX5177: V
DD
= +3V, V
REF
= 1.25V; C
L
= 100pF, FB = OUT, code = FFF hex, T
A
= +25°C,
unless otherwise noted.)
V OUT
(10mV/div)
AC-COUPLED
V DD
(1V/div)
50ms/div
START-UP GLITCH
MAX5175-28
PIN
Feedback Input FB 1
FUNCTION NAME
Voltage Output. High impedance in shutdown. Output voltage is limited to V DD . OUT 2
Power-Down Lockout (digital input). Connect to V DD to allow shutdown. Connect to DGND to disable shut-
down.
PDL 4
Reset Mode Select (digital input). Connect to V DD to select midscale reset output value. Connect to DGND
to select 0 reset output value.
RS 3
Chip-Select Input (digital input). DIN is ignored when CS is high. CS 6
Serial Clock Input (digital input) SCLK 8
Serial-Data Input (digital input). Data is clocked in on the rising edge of SCLK. DIN 7
Clear DAC (digital input). Clears the DAC to its predetermined output state as set by RS. CLR 5
Serial-Data Output DOUT 10
Shutdown (digital input). Pulling SHDN high when PDL = V DD places the chip in shutdown with a maximum
shutdown current of 10µA.
SHDN 12
User-Programmable Output. State is set by the serial input. UPO 11
Reference Input. Maximum V REF is V DD - 1.4V. REF 14
Positive Supply. Bypass to AGND with a 4.7µF capacitor in parallel with a 0.1µF capacitor. V DD 16
No Connect N.C. 15
Analog Ground AGND 13
Digital Ground DGND 9
-25
-20
-10
-15
-5
0
0 1000 500 1500 2000 2500 3000
REFERENCE INPUT FREQUENCY RESPONSE
MAX5175-27
FREQUENCY (kHz)
GAIN (dB)
V REF = 0.67Vp-p + 1.25V DC
MAX5177