AD627ARZ Analog Devices Inc, AD627ARZ Datasheet - Page 17

• Manufacturer Part Number: AD627ARZ
• Description: IC AMP INST R-R 25MA 8SOIC
• Manufacturer: Analog Devices Inc
• Type: Rail-to-Railr

Specifications of AD627ARZ

• Slew Rate: 0.06 V/µs
• Amplifier Type: Instrumentation
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• -3db Bandwidth: 80kHz
• Current - Input Bias: 2nA
• Voltage - Input Offset: 25µV
• Current - Supply: 60µA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 2.2 V ~ 36 V, ±1.1 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 1
• Input Offset Voltage: 200µV
• Gain Db Min: 5dB
• Gain Db Max: 1000dB
• Bandwidth: 40MHz
• Amplifier Output: Rail To Rail
• Cmrr: 77dB
• Supply Voltage Range: ± 1.1V To ±
• Common Mode Rejection Ratio: 90
• Current, Input Bias: 3 nA (Single), 2 nA (Dual)
• Current, Input Offset: 0.3 nA
• Current, Supply: 60 μA
• Impedance, Thermal: 155 °C/W
• Package Type: SOIC-8
• Power Dissipation: 0.8 W
• Resistance, Input: 20 Gigaohms (Differential), 20 Gigaohms (Common-Mode)
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Gain: 1000 V/V
• Voltage, Input: -35.9 to +35 V (Single), -17.9 to +17 V (Dual)
• Voltage, Input Offset: 50 μV (Single), 25 μV (Dual)
• Voltage, Noise: 38 nV/sqrt Hz
• Voltage, Supply: 2.2 to ±18 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Gain Bandwidth Product: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

Table 7. Maximum Gain for Low Common-Mode, Single-Supply Applications
V
±100 mV, V
±50 mV, V
±10 mV, V
V− = 0 V, V+ = 0 V to 1 V
V− = 0 V, V+ = 0 mV to 100 mV
V− = 0 V, V+ = 0 mV to 10 mV
Table 8. RTI Error Sources
Gain
+5
+10
+20
+50
+100
+500
+1000
Table 7 gives values for the maximum gain for various single-
supply input conditions. The resulting output swings refer to
0 V. To maximize the available gain and output swing, set the
voltages on the REF pins to either 2 V or 1 V. In most cases,
there is no advantage to increasing the single supply to greater
than 5 V (the exception is an input range of 0 V to 1 V).
OUTPUT BUFFERING
The AD627 is designed to drive loads of 20 kΩ or greater but
can deliver up to 20 mA to heavier loads at lower output voltage
swings (see Figure 10). If more than 20 mA of output current is
required at the output, buffer the AD627 output with a precision
op amp, such as the OP113. Figure 40 shows this for a single
supply. This op amp can swing from 0 V to 4 V on its output
while driving a load as small as 600 Ω.
IN
V
IN
R
G
CM
CM
CM
AD627
= 0 V
= 0 V
–V
= 0 V
S
0.1µF
0.1µF
AD627A
450
350
300
270
270
252
251
REF
Figure 40. Output Buffering
Maximum Total RTI Offset Error (μV)
+V
S
R
REF Pin
2 V
2 V
2 V
1 V
1 V
1 V
G
OP113
–V
S
0.1µF
0.1µF
AD627B
250
200
175
160
155
151
151
Supply Voltage
5 V to 15 V
5 V to 15 V
5 V to 15 V
10 V to 15 V
5 V to 15 V
5 V to 15 V
V
OUT
Rev. D | Page 17 of 24
R
28.7 kΩ
10.7 kΩ
1.74 kΩ
78.7 kΩ
7.87 kΩ
787 Ω
G
(1% Tolerance)
AD627A
5
4
3.5
3.2
3.1
3
3
Maximum Total RTI Offset Drift (μV/°C)
INPUT AND OUTPUT OFFSET ERRORS
The low errors of the AD627 are attributed to two sources,
input and output errors. The output error is divided by G when
referred to the input. In practice, input errors dominate at high
gains and output errors dominate at low gains. The total offset
error for a given gain is calculated as
RTI offset errors and noise voltages for different gains are listed
in Table 8.
Total Error RTI = Input Error + (Output Error/Gain)
Total Error RTO = (Input Error × G) + Output Error
Resulting Maximum Gain
12.0
23.7
119.9
7.5
31
259.1
AD627B
3
2
1.5
1.2
1.1
1
1
Total RTI Noise (nV/√Hz)
AD627A /AD627B
95
66
56
53
52
52
52
Output Swing WRT 0 V
0.8 V to 3.2 V
0.8 V to 3.2 V
0.8 V to 3.2 V
1 V to 8.5 V
1 V to 4.1 V
1 V to 3.6 V
AD627
(5)
(6)