19-2171; Rev 3; 1/05
16-Bit DACs with 32-Channel
Sample-and-Hold Outputs
General Description
Features
The MAX5631/MAX5632/MAX5633 are 16-bit digital-to-
analog converters (DACs) with 32 sample-and-hold
(SHA) outputs for applications where a high number of
programmable voltages are required. These devices
include a clock oscillator and a sequencer that updates
the DAC with codes from an internal SRAM. No external
components are required to set offset and gain.
ꢀ Integrated 16-Bit DAC and 32-Channel SHA with
SRAM and Sequencer
ꢀ 32 Voltage Outputs
ꢀ 0.005% Output Linearity
ꢀ 200µV Output Resolution
ꢀ Flexible Output Voltage Range
ꢀ Remote Ground Sensing
The MAX5631/MAX5632/MAX5633 feature a -4.5V to
+9.2V output voltage range. Other features include a
200µV/step resolution, with output linearity error, typi-
cally 0.005% of full-scale range (FSR). The 100kHz
refresh-rate updates each SHA every 320µs, resulting
in negligible output droop. Remote ground sensing
allows the outputs to be referenced to the local ground
of a separate device.
ꢀ Fast Sequential Loading: 1.3µs per Register
ꢀ Burst and Immediate Mode Addressing
ꢀ No External Components Required for Setting
Gain and Offset
ꢀ Integrated Output Clamp Diodes
ꢀ Three Output Impedance Options:
MAX5631 (50Ω), MAX5632 (500Ω), and
MAX5633 (1kΩ)
These devices are controlled through a 20MHz
SPI™/QSPI™/MICROWIRE™-compatible 3-wire serial
interface. Immediate Update Mode allows any chan-
nel’s output to be updated within 20µs. Burst Mode
allows multiple values to be loaded into memory in a
single, high-speed data burst. All channels are updated
within 330µs after data has been loaded.
Ordering Information
PART
TEMP RANGE*
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
PIN-PACKAGE
64 TQFP
MAX5631UCB
MAX5631UTK
MAX5632UCB
MAX5632UTK
MAX5633UCB
MAX5633UTK
Each device features an output clamp and output resis-
tors for filtering. The MAX5631 features a 50Ω output
impedance and is capable of driving up to 250pF of out-
put capacitance. The MAX5632 features a 500Ω output
impedance and is capable of driving up to 10nF of output
capacitance. The MAX5633 features a 1kΩ output imped-
ance and is capable of driving up to 10nF of output
capacitance.
68 Thin QFN
64 TQFP
68 Thin QFN
64 TQFP
68 Thin QFN
*For other temperature-range options, contact factory.
The MAX5631/MAX5632/MAX5633 are available in 12mm
x 12mm, 64-pin TQFP, and 10mm x 10mm, 68-pin thin
QFN packages.
Pin Configurations
TOP VIEW
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
________________________Applications
N.C.
N.C.
GS
1
2
3
4
5
6
7
8
9
48
47 CH
46
V
DD
MEMS Mirror Servo Control
Industrial Process Control
Automatic Test Equipment
Instrumentation
V
SS
V
45 OUT20
44 OUT19
43 OUT18
42 OUT17
41 OUT16
40 AGND
LDAC
RST
CS
DIN
SCLK
MAX5631
MAX5632
MAX5633
V
LOGIC
IMMED 10
ECLK 11
39 V
DD
38 OUT15
37 OUT14
36 OUT13
35 OUT12
34 OUT11
33 CL
CLKSEL 12
DGND 13
V
14
AGND 15
16
LSHA
Pin Configurations continued at end of data sheet.
V
SS
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
TQFP
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.