参数资料
型号: AD8610ARMZ-REEL
厂商: Analog Devices Inc
文件页数: 11/24页
文件大小: 0K
描述: IC OPAMP JFET 25MHZ PREC 8MSOP
产品培训模块: Power Line Monitoring
Top Five Problems in Photodiode Opamp Circuits
设计资源: Precision, AC Reference Signal Attenuator Using AD5546/56 Multiplying DAC (CN0025)
标准包装: 1
放大器类型: J-FET
电路数: 1
转换速率: 60 V/µs
增益带宽积: 25MHz
电流 - 输入偏压: 3pA
电压 - 输入偏移: 85µV
电流 - 电源: 3mA
电流 - 输出 / 通道: 45mA
电压 - 电源,单路/双路(±): ±5 V ~ 13 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 标准包装
产品目录页面: 772 (CN2011-ZH PDF)
其它名称: AD8610ARMZ-REELDKR
AD8610/AD8620
Rev. F | Page 19 of 24
Input Offset Voltage Adjustment
Offset of AD8610 is very small and normally does not require
additional offset adjustment. However, the offset adjust pins can
be used as shown in Figure 66 to further reduce the dc offset. By
using resistors in the range of 50 kΩ, offset trim range is ±3.3 mV.
R1
V+
VOUT
V–
AD8610
02
73
0-
0
6
7
6
1
5
4
3
2
Figure 66. Offset Voltage Nulling Circuit
Programmable Gain Amplifier (PGA)
The combination of low noise, low input bias current, low input
offset voltage, and low temperature drift make the AD8610/
AD8620 a perfect solution for programmable gain amplifiers.
PGAs are often used immediately after sensors to increase the
dynamic range of the measurement circuit. Historically, the large
on resistance of switches (combined with the large IB currents
of amplifiers) created a large dc offset in PGAs. Recent and
improved monolithic switches and amplifiers completely remove
these problems. A PGA discrete circuit is shown in Figure 67.
In Figure 67, when the 10 pA bias current of the AD8610 is
dropped across the (<5 Ω) RON of the switch, it results in a
negligible offset error.
When high precision resistors are used, as in the circuit of
Figure 67, the error introduced by the PGA is within the
LSB requirement for a 16-bit system.
VIN
VOUT
AD8610
7
4
6
5
1
2
3
IN1
S1
D1
10k
1k
+5V
–5V
IN2
S2
D2
IN3
S3
D3
IN4
S4
D4
ADG452
3
2
14
15
11
10
6
7
VL
VDD
13
12
1
16
9
8
74HC139
VSS
4
GND
5
1k
100
11
5pF
G = +1
G = +10
G = +100
G = +1000
+5V
–5V
Y0
Y1
Y2
Y3
G
A
B
A0
A1
02
73
0
-06
7
100
Figure 67. High Precision PGA
1. Room temperature error calculation due to RON and IB
ΔVOS = IB × RON = 2 pA × 5 Ω = 10 pV
Total Offset = AD8610 (Offset) + ΔVOS
Total Offset = AD8610 (Offset_Trimmed) + ΔVOS
Total Offset = 5 μV + 10 pV ≈ 5 μV
2. Full temperature error calculation due to RON and IB
ΔVOS (@ 85°C) = IB (@ 85°C) × RON (@ 85°C) =
250 pA × 15 Ω = 3.75 nV
3. The temperature coefficient of switch and AD8610/AD8620
combined is essentially the same as the TCVOS of the
AD8610/AD8620.
ΔVOS/ΔT(total) = ΔVOS/ΔT(AD8610/AD8620) +
ΔVOS/ΔT(IB × RON)
ΔVOS/ΔT(total) = 0.5 μV/°C + 0.06 nV/°C ≈ 0.5 μV/°C
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