AD844ANZ Analog Devices Inc, AD844ANZ Datasheet - Page 17

• Manufacturer Part Number: AD844ANZ
• Description: IC OPAMP CF 60MHZ 80MA 8DIP
• Manufacturer: Analog Devices Inc

Specifications of AD844ANZ

• Slew Rate: 2000 V/µs
• Amplifier Type: Current Feedback
• Number Of Circuits: 1
• -3db Bandwidth: 60MHz
• Current - Input Bias: 200pA
• Voltage - Input Offset: 50µV
• Current - Supply: 6.5mA
• Current - Output / Channel: 80mA
• Voltage - Supply, Single/dual (±): ±4.5 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Op Amp Type: High Speed
• No. Of Amplifiers: 1
• Bandwidth: 60MHz
• Supply Voltage Range: ± 4.5V To ± 18V
• Amplifier Case Style: DIP
• No. Of Pins: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

HIGH SPEED DAC BUFFER
The AD844 performs very well in applications requiring current-
to-voltage conversion. Figure 42 shows connections for use with
the
offset is used so that the full-scale current is ±5.12 mA, which
generates an output of ±5.12 V using the 1 kΩ application resistor
on the AD568. Figure 43 shows the full-scale transient response.
Care is needed in power supply decoupling and grounding
techniques to achieve the full 12-bit accuracy and realize the
fast settling capabilities of the system. The AD568 data sheet
should be consulted for more complete details about its use.
AD568
100
90
10
0
Figure 43. DAC Amplifier Full-Scale Transient Response
current output DAC. In this application, the bipolar
2V
DIGITAL
*POWER SUPPLY BYPASS CAPACITORS.
INPUTS
10
11
12
1
2
3
4
5
6
7
8
9
50ns
MSB
LSB
(Not to Scale)
AD568
TOP VIEW
+15V
–15V
REFCOM
THCOM
ACOM
LCOM
SPAN
SPAN
(V
I
(V
I
BPO
V
OUT
CC
R
EE
TH
L
)
)
24
23
22
21
20
19
18
17
16
15
14
13
Figure 42. High Speed DAC Amplifier
0.22µF*
0.22µF*
100pF
Rev. F | Page 17 of 20
2
3
AD844
20 MHZ VARIABLE GAIN AMPLIFIER
The AD844 is an excellent choice as an output amplifier for the
AD539
AD539 data sheet for full details.) Figure 44 shows a simple
multiplier providing the output:
where V
to 3.2 V (maximum), and V
±2 V full scale but capable of operation up to ±4.2 V.
The peak output in this configuration is thus ±6.7 V. Using all
four of the internal application resistors provided on the AD539
in parallel results in a feedback resistance of 1.5 kΩ, at which
value the bandwidth of the AD844 is about 22 MHz, and is
essentially independent of V
4
0V TO 3V
7
*V
INPUTS
TYPICALLY BY USING A 50Ω OR 75Ω RESISTOR TO GROUND.
±2V FS
X
INPUT
0.22µF
V
AND V
GND
V
V
W
X
6
Y
3nF
*
*
multiplier, in all of its connection modes. (See the
X
=
is the gain control input, a positive voltage from 0 V
Y
−
INPUTS MAY OPTIONALLY BE TERMINATED;
GROUND
V
–5V
2
X
10Ω
0.22µF
V
Figure 44. 20 MHz VGA Using the AD539
V
Y
R
1
2
3
4
5
6
7
8
I
(Not to Scale)
TOP VIEW
0.22µF*
0.22µF*
AD539
Y
10Ω
X
is the signal voltage, nominally
. The gain at V
DIGITAL
SUPPLY
+15V
–15V
ANALOG
SUPPLY
GROUND
V
16
15
14
13
12
11
10
9
OUT
0.22µF
0.22µF
2
3
10Ω
AD844
X
= 3.16 V is 4 dB.
10Ω
7
4
V
W
+V
TYP +6V
AT 15µA
–V
TYP –6V
AT 15µA
6
=
S
S
OUTPUT
AD844
V
–V
W
2V
X
V
Y
(1)