MAX5133A 데이터 시트보기 (PDF) - Maxim Integrated
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MAX5133A Datasheet PDF : 20 Pages
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+5V/+3V, 13-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
CS DIN SCLK
VDD AGND DGND
PDL
PD
RSTVAL
CLR
SR
CONTROL
16-BIT
SHIFT REGISTER
LOGIC
OUTPUT
MAX5132
MAX5133
DECODE
CONTROL
13
INPUT
REGISTER
DAC
REGISTER
DAC
DOUT
UPO
FB
OUT
BANDGAP 1.25V
REFERENCE
4k
2X
2.5V (1.25V)
(X1)
REFERENCE
BUFFER
REFADJ
REF
( ) FOR MAX5133 ONLY.
Figure 1. Simplified Functional Diagram
_______________Detailed Description
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.
Internal Reference
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
FB
R
R
R
OUT
2R 2R
D0
2R
2R
2R
D10
D11
D12
REF*
AGND
SHOWN FOR ALL 1s ON DAC
*INTERNAL REFERENCE: 2.5V (MAX5132),
1.25V (MAX5133); OR EXTERNAL REFERENCE
Figure 2. Simplified Inverted R-2R DAC Structure
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