AD744KRZ Analog Devices Inc, AD744KRZ Datasheet - Page 9

• Manufacturer Part Number: AD744KRZ
• Description: IC OPAMP BIFET 13MHZ PREC 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD744KRZ

• Slew Rate: 75 V/µs
• Amplifier Type: J-FET
• Number Of Circuits: 1
• -3db Bandwidth: 13MHz
• Current - Input Bias: 30pA
• Voltage - Input Offset: 250µV
• Current - Supply: 3.5mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): ±4.5 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: Precision
• No. Of Amplifiers: 1
• Bandwidth: 13MHz
• Supply Voltage Range: ± 4.5V To ± 18V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Common Mode Rejection Ratio: 88
• Current, Input Bias: 30 pA
• Current, Input Offset: 10 pA
• Current, Output: 25 mA
• Harmonic Distortion: 0.0003 %
• Impedance, Thermal: 42 °C/W
• Package Type: SOIC-8
• Power Dissipation: 500 mW
• Resistance, Input: 3×10^12 Ohms
• Temperature, Operating, Range: 0 to +70 °C
• Voltage, Input: ±20 V (Differential), -11.5 to +14.5 V (Common-Mode)
• Voltage, Noise: 45 nV/sqrt Hz
• Voltage, Offset: 0.25 mV
• Voltage, Output, High: +13.9 V
• Voltage, Output, Low: -13.3 V
• Voltage, Supply: ±15 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

Using Decompensation to Extend the Gain Bandwidth
Product
When the AD744 is used in applications where the closed-loop
gain is greater than 10, gain bandwidth product may be enhanced
by connecting a small capacitor between Pins 1 and 5 (Figure
33). At low frequencies, this capacitor cancels the effects of the
chip’s internal compensation capacitor, C
ompensating the amplifier.
V
IN
SEE TABLE II
R1
R1
( )
4.99 k
4.99 k
4.99 k
4.99 k
499 Ω
499 Ω
499 Ω
NOTES
1
2
Bandwidth with C
Into large capacitive loads the AD744’s 25 mA output current limit sets the slew rate of the amplifier, in V/ µs, equal to 0.025
amps divided by the value of C
specified with a 50 pF. load.
Table II. Recommended Values of C
Figures 31 and 32.
AD744
–V
C
S
4.99 k
4.99 k
4.99 k
4.99 k
4.99 k
4.99 k
4.99 k
LEAD
( )
+V
R2
S
1 F
LEAD
C
COMP
R2
1 F
adjusted for minimum settling time.
OPTIONAL
Follower
0.1 F
Gain
2
2
2
2
11
11
11
LOAD
COMP
0.1 F
in µF. Slew rate is specified into rated max C
, effectively dec-
Inverter
Gain
V
OUT
1
1
1
1
10
10
10
COMP
vs. Various Load Conditions for the Circuits of
C
50
150
1000
270
390
1000
>2000
Max
(pF)
LOAD
Due to manufacturing variations in the value of the internal
C
optimized for the desired gain by using a 2 to 10 pF trimmer
capacitor rather than using a fixed value.
R1
( )
1 k
100
100
Table III. Performance Summary for the Circuit of Figure 33
COMP
C
(pF)
, it is recommended that the amplifier’s response be
R2
( )
10 k
10 k
100 k 1001
0
5
20
25
0
2
5
COMP
V
IN
LOAD
R1
Gain
Follower
11
101
C
except for cases marked
(pF)
7
7
–
–
–
–
–
LEAD
–V
AD744
S
+V
(V/ s)
Slew
Rate
75
37
14
12.5
75
50
37
1 F
S
Gain
Inverter
10
100
1000
2
2 – 10pF
2
R2
1 F
NOT CONNECTED
0.1 F
2
Bandwidth
, which are
(MHz)
–3 dB
2.5
2.3
1.2
1.0
1.2
0.85
0.60
–3 dB
Bandwidth
2.5 MHz
760 kHz
225 kHz
0.1 F
SEE TABLE III
1
1
AD744
V
OUT
Gain/BW
Product
25 MHz
76 MHz
225 MHz