参数资料
型号: ADR06BKSZ-REEL7
厂商: Analog Devices Inc
文件页数: 16/20页
文件大小: 0K
描述: IC VREF SERIES PREC 3V SC-70-5
标准包装: 1
基准类型: 串联,精度
输出电压: 3V
容差: ±0.1%
温度系数: 9ppm/°C
输入电压: 5 V ~ 36 V
通道数: 1
电流 - 静态: 1mA
电流 - 输出: 10mA
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 6-TSSOP(5 引线),SC-88A,SOT-353
供应商设备封装: SC-70-5
包装: 标准包装
产品目录页面: 795 (CN2011-ZH PDF)
其它名称: ADR06BKSZ-REEL7DKR
ADR01/ADR02/ADR03/ADR06
Data Sheet
0.80
0.75
V IN = 15V
SAMPLE SIZE = 5
V IN
I IN
ADR01/
0.70
ADR02/
ADR03/
V OUT
0.65
0.60
0.55
0.50
ΔV TEMP /ΔT ≈ 1.96mV/°C
ADR06
GND
R SET
I Q ≈ 0.6mA
R L
V L
I SET = (V OUT – V L )/R SET
I L = I SET + I Q
0.45
0.40
–50
–25
0
25
50
75
100
125
Figure 38. Low Cost Current Source
I L =
V REF × D
TEMPERATURE (°C)
Figure 36. Voltage at TEMP Pin vs. Temperature
The TEMP function is provided as a convenience rather than a
precise feature. Because the voltage at the TEMP node is
acquired from the band gap core, current pulling from this pin
has a significant effect on V OUT . Care must be taken to buffer the
TEMP output with a suitable low bias current op amp, such as
the AD8601, AD820, or OP1177, all of which result in less than
a 100 μV change in ?V OUT (see Figure 37). Without buffering,
even tens of microamps drawn from the TEMP pin can cause
V OUT to fall out of specification.
PRECISION CURRENT SOURCE WITH
ADJUSTABLE OUTPUT
Alternatively, a precision current source can be implemented
with the circuit shown in Figure 39. By adding a mechanical or
digital potentiometer, this circuit becomes an adjustable current
source. If a digital potentiometer is used, the load current is
simply the voltage across Terminal B to Terminal W of the
digital potentiometer divided by R SET .
(1)
R SET
15V
V IN
U1
ADR01/
ADR02/
ADR03/
ADR06
V IN V OUT
V O
where D is the decimal equivalent of the digital potentiometer
input code.
U1
ADR01/
ADR02/
W
V TEMP
1.9mV/°C
U2
V+
OP1177
V–
TEMP TRIM
GND
+12V
ADR03/
ADR06
V IN V OUT
TEMP TRIM
GND
0V TO (5V + V L )
B
AD5201
100k ?
A
Figure 37. Temperature Monitoring
+12V
R SET
1k?
U2
LOW COST CURRENT SOURCE
V+
OP1177
Unlike most references, the ADR01/ADR02/ADR03/ADR06
–5V TO V L
V–
V L
R L 1k?
employ an NPN Darlington in which the quiescent current
remains constant with respect to the load current, as shown in
Figure 23 . As a result, a current source can be configured as
shown in Figure 38 where I SET = (V OUT ? V L )/R SET . I L is simply
the sum of I SET and I Q . Although simple, I Q varies typically from
0.55 mA to 0.65 mA, limiting this circuit to general-purpose
applications.
–12V I L
Figure 39. Programmable 0 mA to 5 mA Current Source
To optimize the resolution of this circuit, dual-supply op amps
should be used because the ground potential of ADR02 can
swing from ?5.0 V at zero scale to V L at full scale of the
potentiometer setting.
Rev. R | Page 16 of 20
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