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| 型号： | AD5765BSUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT 5V QUAD 32-TQFP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 产品变化通告： | AD5763/65 Metal Layer Edit Change 08/Sept/2009 |
| 设计资源： | High Accuracy, Bipolar Voltage Output Digital-to-Analog Conversion Using AD5765 (CN0073) |
| 标准包装： | 500 |
| 设置时间： | 8µs |
| 位数： | 16 |
| 数据接口： | 串行 |
| 转换器数目： | 4 |
| 电压电源： | 双 ± |
| 功率耗散（最大）： | 76mW |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（7x7） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电压，双极 |
| 采样率（每秒）： | * |
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Data Sheet
AD5765
Rev. C | Page 25 of 28
APPLICATIONS INFORMATION
TYPICAL OPERATING CIRCUIT
Figure 29 shows the typical operating circuit for the AD5765.
The only external components needed for this precision 16-bit
DAC are a reference voltage source, decoupling capacitors on
the supply pins and reference inputs, and an optional short-
circuit current setting resistor. Because the device incorporates
reference buffers, it eliminates the need for an external bipolar
reference and associated buffers. This leads to an overall savings
in both cost and board space.
to 5 V. In Figure 29, AGNDx is connected to REFGND.
1
2
3
4
5
6
7
8
23
22
21
18
19
20
24
17
9
10 11
12
13 14 15
16
32 31 30
29 28 27 26
25
AD5765
SYNC
SCLK
SDIN
SDO
D0
LDAC
CLR
D1
VOUTA
VOUTB
AGNDB
VOUTD
VOUTC
AGNDC
AGNDA
AGNDD
RS
T
O
UT
R
S
TIN
DG
ND
DV
CC
AV
DD
P
G
ND
AV
SS
IS
CC
BI
N/
2sCO
M
P
AV
DD
AV
SS
T
EMP
RE
F
G
ND
NC
RE
F
CD
RE
F
AB
SYNC
SCLK
SDIN
SDO
LDAC
D0
D1
RSTOUT
RSTIN
BIN/2sCOMP
+5V
–5V
NC = NO CONNECT
+5V –5V
VOUTA
VOUTB
VOUTC
VOUTD
100nF
100n
F
100n
F
10F
100nF
10F
10
F
10F
ADR420
4
GND
2
6
VOUT
VIN
+5V
100nF
10F
07249-
035
Figure 29. Typical Operating Circuit
PRECISION VOLTAGE REFERENCE SELECTION
To achieve the optimum performance from the AD5765 over its
full operating temperature range, a precision voltage reference
must be used. Thought should be given to the selection of a
precision voltage reference. The AD5765 has two reference
inputs, REFAB and REFCD. The voltages applied to the
reference inputs are used to provide a buffered positive and
negative reference for the DAC cores. Therefore, any error in
the voltage reference is reflected in the outputs of the device.
There are four possible sources of error to consider when
choosing a voltage reference for high accuracy applications:
initial accuracy, temperature coefficient of the output voltage,
long-term drift, and output voltage noise.
Initial accuracy error on the output voltage of an external refer-
ence may lead to a full-scale error in the DAC. Therefore, to
minimize these errors, a reference with low initial accuracy
error specification is preferred. Choosing a reference with an
output trim adjustment, such as the ADR430, allows a system
designer to trim system errors out by setting the reference
voltage to a voltage other than the nominal. The trim adjust-
ment can also be used at temperature to trim out any error.
Long-term drift is a measure of how much the reference output
voltage drifts over time. A reference with a tight long-term drift
specification ensures that the overall solution remains relatively
stable over its entire lifetime.
The temperature coefficient of a reference output voltage affects
INL, DNL, and TUE. A reference with a tight temperature
coefficient specification should be chosen to reduce the
dependence of the DAC output voltage on ambient conditions.
In high accuracy applications (which have a relatively low noise
budget), reference output voltage noise needs to be considered.
Choosing a reference with as low an output noise voltage as
practical for the system resolution required is important.
Precision voltage references such as the ADR420 (XFET design)
produce low output noise in the 0.1 Hz to 10 Hz region.
However, as the circuit bandwidth increases, filtering the output
of the reference may be required to minimize the output noise.
Table 21. Some Precision References Recommended for Use with the AD5765
Part No.
Initial Accuracy (mV Max)
Long-Term Drift (ppm Typ)
Temp Drift (ppm/°C Max)
0.1 Hz to 10 Hz Noise (V p-p Typ)
±1
40
3
3.5
±1
50
3
1.75
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