参数资料
型号: AD549KH
厂商: Analog Devices Inc
文件页数: 9/20页
文件大小: 0K
描述: IC OPAMP GP 1MHZ LP 20MA TO99-8
标准包装: 1
系列: Topgate™
放大器类型: 通用
电路数: 1
转换速率: 3 V/µs
增益带宽积: 1MHz
电流 - 输入偏压: 0.075pA
电压 - 输入偏移: 150µV
电流 - 电源: 600µA
电流 - 输出 / 通道: 20mA
电压 - 电源,单路/双路(±): ±5 V ~ 18 V
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: TO-99-8 金属罐
供应商设备封装: TO-99-8
包装: 散装
AD549
Rev. H | Page 17 of 20
The pH probe output is ideally 0 V at a pH of 7, independent
of temperature. The slope of the transfer function of the probe,
though predictable, is temperature dependent (54.2 mV/pH at
0°C and 74.04 mV/pH at 100°C). By using an AD590 tempera-
ture sensor and an AD534 analog divider, an accurate temperature
compensation network can be added to the basic pH probe ampli-
fier. Table 4 shows voltages at various points, thereby illustrating
the compensation. The AD549 is set for a noninverting gain of
13.51. The output of the AD590 circuitry (Point C) is equal to
10 V at 100°C and decreases by 26.8 mV/°C. The output of the
AD534 analog divider (Point D) is a temperature-compensated
output voltage centered at 0 V for a pH of 7 and has a transfer
function of –1.00 V/pH unit. The output range spans from
7.00 V (pH = 14) to +7.00 V (pH = 0).
00
51
1-
0
46
8
14
10 Z2
12
OUT
7
Y2
6
Y1
11 Z1
1
X1
2
X2
AD534
0.1F
+15V
0.1F
–15V
OUTPUT
(D)
(B)
(C)
26.6k
+
AD590
IN STAINLESS
STEEL PROBE
OR AC2626
+15V
3
2
6
4
8
7
AD549
0.1F
pH
PROBE
OUTPUT
(A)
1k
12k
1k
SCALE FACTOR
ADJUST
Figure 46. Temperature Compensated pH Amplifier
Table 4. Illustration of Temperature Compensation
Point
Probe Temperature (°C)
A (Probe Output) (mV)
B (A × 13.51) (V)
C (AD590 Output) (V)
D (10 × (B ÷ C)) (V)
0
54.20
0.732
7.32
1.00
25
59.16
0.799
7.99
1.00
37
61.54
0.831
8.31
1.00
60
66.10
0.893
8.93
1.00
100
74.04
1.000
10.00
1.00
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