max5774 Maxim Integrated Products, Inc., max5774 Datasheet - Page 15

• Manufacturer Part Number: max5774
• Description: 32-channel, 14-bit, Voltage-output Dacs With Serial Interface
• Manufacturer: Maxim Integrated Products, Inc.

grounds (see the Functional Diagram). Three output
channels of each channel bank (bank 0 and bank 1)
are referenced to GS2 (OUT0, OUT1, OUT2 in bank 0,
and OUT16, OUT17, OUT18 in bank 1). All other output
channels are referenced to GS1.
The MAX5773/MAX5774/MAX5775 analog and digital
sections have separate power inputs (AV
DV
output buffers (AV
cuitry prevents output glitches at power-up and elimi-
nates the need for power sequencing. A software-
shutdown mode facilitates efficient power manage-
ment. When shut down, the MAX5773/MAX5774/
MAX5775 consume 50µA (typ) of supply current.
The MAX5773/MAX5774/MAX5775 have a 5µs (typ)
wake-up time from shutdown mode to normal
DAC operation.
All DACs provide buffered outputs that can drive 10kΩ in
parallel with 100pF. The MAX5773 has a 0 to +10V out-
put range; the MAX5774 has a -2.5V to +7.5V output
range; and the MAX5775 has a -5V to +5V output range.
Figure 1. Serial-Interface Timing
Table 1. Offset DAC Codes
*S1 = S0 = 0 for proper operation.
DD
(DSP MODE)
(µC MODE)
MAX5773
MAX5774
MAX5775
). Separate power inputs are also provided for the
PART
SCLK
DIN
CS
CS
X
CC
______________________________________________________________________________________
D13
0
0
1
t
SCS
and V
t
CSPWH
X
D12
0
1
0
SS
). Proprietary deglitch cir-
D11
32-Channel, 14-Bit, Voltage-Output
0
0
0
t
CSPWL
t
CSS
1
D10
t
DS
C3
0
0
0
D9
0
0
0
t
DH
DD
2
D8
0
0
0
and
DACs with Serial Interface
C2
t
CL
D7
0
0
0
The REF voltage sets the full-scale output voltage for all
32 DACs. REF accepts a +3.0V ±3% input. Reference
voltages outside these limits result in a degradation of
device performance.
REF is a buffered input. The input impedance is 1MΩ
minimum and it does not vary with code. Use a high-
accuracy, low-noise voltage reference such as the
MAX6126AASA30 (3ppm/°C temperature drift and
0.02% initial accuracy) to improve static accuracy. REF
does not accept AC signals.
The MAX5773/MAX5774/MAX5775 include ground-sense
inputs (GS1 and GS2) that allow the output voltages to be
referenced to a remote ground. The ground-sense input
GS1 is connected to channels OUT3–OUT15 (bank 0)
and to channels OUT19–OUT31 (bank 1). The ground-
sense input GS2 is connected to channels OUT0, OUT1,
OUT2 (bank 0), and OUT16, OUT17, OUT18 (bank 1).
Channels connected to the same ground sense can be
accessed in pairs. For example, OUT0 and OUT16 can
t
D6
CH
4
0
0
0
C0
D5
0
0
0
D4
0
0
0
26
External Reference Input (REF)
Ground Sense (GS1 and GS2)
S0
D3
0
0
0
D2
0
0
0
32
D1
t
0
0
0
CS2
D0
0
0
0
t
CS1
S1*
0
0
0
S0*
0
0
0
15