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DAC8162-Q1 数据表(PDF) 26 Page - Texas Instruments

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部件名 DAC8162-Q1
功能描述  Low-Power, Buffered, Voltage-Output DACs
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

DAC8162-Q1 数据表(HTML) 26 Page - Texas Instruments

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IN
O UT
REF
n
D
V
=
V
Gain
2
æ
ö
´
´
ç
÷
è
ø
DAC
Gain
Register
Register
REF(+)
Resistor String
REF( )
-
GND
V
/
V
REFIN
REFOUT
V
OUT
150 kW
150 kW
D
IN
n
DAC756x-Q1 (12-Bit)
DAC816x-Q1 (14-Bit)
DAC856x-Q1 (16-Bit)
Data Buffer A
DAC Register A
Buffer Control
Register Control
Control Logic
Power-
Down
Control
Logic
AV
DD
V
REFIN
REFOUT
/
V
CLR
LDAC
2.5-V
Reference
Data Buffer B
DAC Register B
V
B
OUT
V
A
OUT
GND
DAC
DAC
Input Control Logic
SYNC
SCLK
D
IN
DAC7562-Q1, DAC7563-Q1
DAC8162-Q1, DAC8163-Q1
DAC8562-Q1, DAC8563-Q1
SLAS950A – MAY 2013 – REVISED JUNE 2015
www.ti.com
8 Detailed Description
8.1 Overview
The DAC756x-Q1, DAC816x-Q1, and DAC856x-Q1 devices are low-power, voltage-output, dual-channel, 12-,
14-, and 16-bit digital-to-analog converters (DACs), respectively. These devices include a 2.5-V, 4-ppm/°C
internal reference, giving a full-scale output voltage range of 2.5 V or 5 V. The internal reference has an initial
accuracy of ±5 mV and can source or sink up to 20 mA at the VREFIN/VREFOUT pin.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Digital-to-Analog Converter (DAC)
The DAC756x-Q1, DAC816x-Q1, and DAC856x-Q1 architecture consists of two string DACs, each followed by
an output buffer amplifier. The devices include an internal 2.5-V reference with 4-ppm/°C temperature drift
performance. Figure 88 shows a principal block diagram of the DAC architecture.
Figure 88. DAC Architecture
The input coding to the DAC756x-Q1, DAC816x-Q1, and DAC856x-Q1 devices is straight binary, so the ideal
output voltage is given by Equation 1:
(1)
where:
n = resolution in bits; either 12 (DAC756x-Q1), 14 (DAC816x-Q1) or 16 (DAC856x-Q1)
DIN = decimal equivalent of the binary code that is loaded to the DAC register. DIN ranges from 0 to 2
n – 1.
VREF = DAC reference voltage; either VREFOUT from the internal 2.5-V reference or VREFIN from an
aaa external reference.
Gain = 1 by default when internal reference is disabled (using external reference), and gain = 2 by default
aaa when using internal reference. Gain can also be manually set to either 1 or 2 using the gain register.
aaa See the Gain Function section for more information.
26
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Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: DAC7562-Q1 DAC7563-Q1 DAC8162-Q1 DAC8163-Q1 DAC8562-Q1 DAC8563-Q1


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