MAX5133AEEE+ Maxim Integrated Products, MAX5133AEEE+ Datasheet - Page 10

• Manufacturer Part Number: MAX5133AEEE+
• Description: IC DAC 13BIT 3V LP SER 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5133AEEE+

• Settling Time: 20µs
• Number Of Bits: 13
• Data Interface: Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -

+5V/+3V, 13-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
Figure 1. Simplified Functional Diagram
The MAX5132/MAX5133 13-bit, force/sense DACs are
easily configured with a 3-wire serial interface. They
include a 16-bit data-in/data-out shift register and have a
double-buffered digital input consisting of an input regis-
ter and a DAC register. In addition, these devices
employ precision bandgap references, as well as an out-
put amplifier with accessible feedback and output pins
that can be used for setting the gain externally (Figure 1)
or for forcing and sensing applications. These DACs
are designed with an inverted R-2R ladder network
(Figure 2) that produces a weighted voltage proportion-
al to the digital input code.
Both devices use an on-board precision bandgap ref-
erence with a low temperature coefficient of only
10ppm/°C (max) to generate an output voltage of +2.5V
(MAX5132) or +1.25V (MAX5133). The REF pin can
source up to 100µA and may become unstable with
capacitive loads exceeding 100pF. REFADJ can be
used for minor adjustments to the reference voltage.
The circuits in Figures 3a and 3b achieve a nominal ref-
erence adjustment range of ±1%. Connect a 33nF
capacitor from REFADJ to AGND to establish low-noise
10
_______________Detailed Description
______________________________________________________________________________________
RSTVAL
PDL
CLR
PD
( ) FOR MAX5133 ONLY.
CS
REFERENCE
BANDGAP
CONTROL
Internal Reference
DIN SCLK
SR
MAX5132
MAX5133
1.25V
4k
13
REFADJ
SHIFT REGISTER
16-BIT
V
REGISTER
(X1)
DD
2X
INPUT
AGND DGND
REFERENCE
CONTROL
BUFFER
DECODE
2.5V (1.25V)
Figure 2. Simplified Inverted R-2R DAC Structure
AGND
REGISTER
REF*
SHOWN FOR ALL 1s ON DAC
DAC
2R
2R
DAC
D0
REF
R
OUTPUT
LOGIC
2R
*INTERNAL REFERENCE: 2.5V (MAX5132),
D10
1.25V (MAX5133); OR EXTERNAL REFERENCE
R
2R
D11
R
DOUT
UPO
FB
OUT
2R
D12
FB
OUT