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MAX44205

Description
Fully Differential Op Amp/SAR ADC Driver
File Size2MB,29 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX44205 Overview

Fully Differential Op Amp/SAR ADC Driver

MAX44205
180MHz, Low-Noise, Low-Distortion,
Fully Differential Op Amp/SAR ADC Driver
General Description
The MAX44205 is a low-noise, low-distortion fully differ-
ential operational amplifier suitable for driving high-speed,
high-resolution, 20-/18-/16-bit SAR ADCs, including the
MAX11905 ADC family. Featuring a combination of wide
2.7V to 13.2V supply voltage range and wide 400MHz
bandwidth, the MAX44205 is suitable for low-power, high-
performance data acquisition systems.
The MAX44205 offers a VOCM input to adjust the out-
put common-mode voltage, eliminating the need for a
coupling transformer or AC-coupling capacitors. This
adjustable output common-mode voltage allows the
MAX44205 to match the input common-mode voltage
range of the ADC following it. A proprietary output voltage
clamping solution ensures that the buffer output does not
violate the ADC’s maximum input voltage range, even if
the MAX44205’s supply rails are higher than the ADC’s
full-scale range. Shutdown mode consumes only 6.8µA
and extends battery life in battery-powered applications
or reduces average power in systems cycling between
shutdown and periodic data readings.
The MAX44205 is available in 12-pin, 3mm x 3mm, TQFN
and 10-pin μMAX® packages and is specified for opera-
tion over the -40°C to +125°C temperature range.
For related parts and recommended products to use with this part, refer
to
www.maximintegrated.com/MAX44205.related.
Features and Benefits
Low Input Noise to Drive Precision SAR ADCs
3.1nV/√Hz at 1kHz
• 200nV
P-P
from 0.1Hz to 10Hz
High Speed for DC and AC Applications
• Gain-Bandwidth Product 400MHz
• -3dB Gain-Bandwidth Product 180MHz
• Slew Rate 180V/µs
Ultra-Low Distortion Drives AC Inputs to 20-Bit SAR
ADCs
THD = -130dBc at 10kHz, V
OUT,DIFF
= 2V
P-P
• THD = -84dBc at 1MHz, V
OUT,DIFF
= 2V
P-P
Wide Supply Range (2.7V to 13.2V) Drives Unipolar
or Bipolar (±6.6V) Signals
3.7mA Quiescent Supply Current with Only 6.8µA
Shutdown Current
Input Pins for Output(s) Voltage Clamping Avoids
ADC Saturation
12-Pin, 3mm x 3mm TQFN and 10-Pin
μMAX
Packages Save Board Space
Applications
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Single-Ended to Differential Conversion
High-Speed Process Control
Medical Imaging
Fully-Differential Signal Conditioning
Active Filters
Typical Application Circuit
3V
4.7nF
C0G
4.7nF
C0G
Ordering Information
appears at end of data sheet.
3.2V
TO
12.6V
OUT
IN
MAX6126
GND
10µF
MAX44205 DRIVING MAX11905
0.0
-10.0
(f
SAMPLE
= 1Msps, f
IN
= 10kHz,
65,536-Point FFT)
1kΩ
0.1%
+5V
1kΩ
0.1%
3.3V
3.3V
10Ω 0.1%
OUT+
2.2nF
COG
10Ω 0.1%
ADC INPUT FILTER
A
IN-
GND
REFV
DD
V
REFIN
A
IN+
A
VDD
-20.0
1kΩ
0.1%
+
AMPLITUDE (dBFS)
-
V
SIG
V
S+
V
CLPH
-30.0
-40.0
-50.0
-60.0
-70.0
-80.0
-90.0
-100.0
-110.0
-120.0
Dual
±5V
Supplies
V
OUTDIFF
=
6V
P-P
THD =
-112.9dBc
SFDR =
114.7dBc
SNR =
97.5dB
SINAD =
97.3dB
1.5V
2.2µF
X7R
V
CM
1kΩ
0.1%
0.1µF
VOCM
MAX44205
OUT-
MAX11905
-
V
SIG
V
S-
V
CLPL
+
-5V
1kΩ
0.1%
1kΩ
0.1%
4.7nF
C0G
-130.0
-140.0
0
50
100
150
200
250
300
350
400
450
500
4.7nF
C0G
FREQUENCY (kHz)
19-6951; Rev 0; 6/14
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