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DAC11001A Datasheet(PDF) 27 Page - Texas Instruments

No. de Pieza. DAC11001A
Descripción  DACx1001 20-Bit, 18-Bit, and 16-Bit, Low-Noise, Ultra-Low Harmonic Distortion, Fast-Settling, High-Voltage Output, Digital-to-Analog Converters (DACs)
Descarga  42 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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DAC11001A Datasheet(HTML) 27 Page - Texas Instruments

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DAC110 01
C1
OPA189
VREFP
OPA189
REFNF
REFNS
REFPF
REFPS
+
±
+
±
VSE T/
ISET
Battery
Charge/
Discha rge
Circuit
RSENS E
1
V
SENSE
I
2
R
1
A
x 1
R
xG
R
§
·
¨
¸
©
¹
27
DAC11001A, DAC91001, DAC81001
www.ti.com
SLASEL0 – OCTOBER 2019
Product Folder Links: DAC11001A DAC91001 DAC81001
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Typical Application (continued)
Precision reference sources are available at 5 V or less. Use a ±5-V reference with a 2x gain configuration to get
an output of ±10 V. The DAC output amplifier sets the gain at 2, assuming GV = 1, as shown in Equation 3. R1
and R2 are 1-kΩ each. Equation 3 shows the calculation for the current gain when the switch is in the position 2.
(3)
In order to get ±20-mA output current range with R1 = R2, RSENSEx GI must be 500. Choose GI as 50 so that
RSENSE can be 10-Ω. For a ±20mA output current, the voltage drop across RSENSE is ±200-mV. Choose a higher
value for GI and a smaller resistance value for RSENSE in case the design requires a lower voltage headroom.
There is no equation to select C1 and C2. The values of C1 and C2 depend on the stability criteria of the
reference buffers when driving the reference inputs of DACx1001. The values are obtained through simulation.
For the OPA828, use C1 = C2 = 100 pF. The 1-MΩ resistors in the circuit are used for making sure the amplifiers
are not left in open loop.
9.2.2 Battery Test Equipment (BTE)
Battery test equipment is used for lithium-ion battery formation, end-of-line testing, and diagnostics. For battery
diagnostics, high-precision DACs, such as the DACx1001, are required to maintain a highly stable voltage over
temperature and time.
Figure 16. Battery Test Equipment
9.2.2.1 Design Requirements
Output range: 0 V to 5 V
System level temperature drift: ±2 ppm/°C
9.2.2.2 Detailed Design Procedure
To get unipolar output from DACx1001, connect the negative reference input to ground as shown in Figure 16.
The OPA189 is a zero-drift amplifier with ±0.02 ppm/°C. The DACx1001 has a temperature drift of offset error of
±0.04 ppm/°C. The temperature drifts of the DAC and amplifier might be neglected when compared to the
temperature drift of the reference source. The best reference sources offer temperature drifts of the order of
±2.5 ppm/°C to ±3 ppm/°C. A temperature calibration is needed for the voltage reference to achieve the goal of
±2 ppm/°C.


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