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PDF ADA4350 Data sheet ( Hoja de datos )
| Número de pieza | ADA4350 | |
| Descripción | FET Input Analog Front End | |
| Fabricantes | Analog Devices | |
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Data Sheet
FET Input Analog Front End
with ADC Driver
ADA4350
FEATURES
GENERAL DESCRIPTION
Low noise, low input bias current FET input amplifier
Very low input bias current: ±0.25 pA typical at 25°C
Low input voltage noise
92 nV/√Hz typical at 10 Hz at 5 V
5 nV/√Hz typical at 100 kHz at ±5 V
Gain bandwidth product: 175 MHz
Input capacitance
3 pF typical, differential mode
2 pF typical, common mode
Integrated gain switching
Sampling and feedback switch off leakage: ±0.5 pA typical
Worst case tON/tOFF times: 105 ns typical/65 ns typical
The ADA4350 is an analog front end for photodetectors or other
sensors whose output produces a current proportional to the
sensed parameter or voltage input applications where the system
requires the user to select between very precise gain levels to
maximize the dynamic range.
The ADA4350 integrates a FET input amplifier, a switching network,
and an ADC driver with all functions controllable via a serial
peripheral interface (SPI) or parallel control logic into a single
IC. The FET input amplifier has very low voltage noise and current
noise making it an excellent choice to work with a wide range of
photodetectors, sensors, or precision data acquisition systems.
Integrated analog-to-digital converter (ADC) driver
Its switching network allows the user individual selection of up
Differential mode and single-ended mode
to six different, externally configurable feedback networks; by
Adjustable output common-mode voltage
using external components for the feedback network, the user
−5 V to +3.8 V typical for ±5 V supply
can more easily match the system to their desired photodetector or
Wide output voltage swing: ±4.8 V minimum for ±5 V supply
sensor capacitance. This feature also allows the use of low thermal
Linear output current: 18 mA rms typical for ±5 V supply
drift resistors, if required.
SPI or parallel switch control of all functions
Wide operating range: 3.3 V to 12 V
Quiescent current: 8.5 mA typical (±5 V full system)
APPLICATIONS
The design of the switches minimizes error sources so that they
add virtually no error in the signal path. The output driver can
be used in either single-ended or a differential mode and is
ideal for driving the input of an ADC.
Current to voltage (I to V) conversions
Photodiode preamplifiers
Chemical analyzers
Mass spectrometry
Molecular spectroscopy
The ADA4350 can operate from a single +3.3 V supply or a dual
±5 V supply, offering user flexibility when choosing the polarity of
the detector. It is available in a Pb-free, 28-lead TSSOP package and
is specified to operate over the −40°C to +85°C temperature range.
Laser/LED receivers
Multifunction pin names may be referenced by their relevant
Data acquisition systems
function only.
FUNCTIONAL BLOCK DIAGRAM
ADA4350
987654
27 1
IN-N 10
IN-P 11
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
SPI INTERFACE
12 13
16 17 19 20 21 22 23
28 2
P1
M1
25
3 VOUT1
26 VOUT2
FET AMP
SWITCHING NETWORK
Figure 1.
ADC DRIVER
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2015–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADA4350
Data Sheet
±5 V FET INPUT AMPLIFIER
TA = 25°C, +VS = +5 V, −VS = −5 V, RL = 1 kΩ, unless otherwise specified.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Gain Bandwidth Product
Slew Rate
Settling Time to 0.1%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion (HD2/HD3)
Input Voltage Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
Output Voltage Swing
Linear Output Current
Short-Circuit Current
POWER SUPPLY
Operating Range
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Test Conditions/Comments
G = −5, VOUT = 100 mV p-p
G = −5, VOUT = 2 V p-p
VOUT = 2 V step, 10% to 90%
G = −5, VOUT = 2 V step
f = 100 kHz, VOUT = 2 V p-p, G = −5
f = 1 MHz, VOUT = 2 V p-p, G = −5
f = 10 Hz
f = 100 kHz
From −40°C to +85°C
From 25°C to 85°C
At 25°C
At 85°C
At 25°C
At 85°C
VOUT = ±2 V
Common mode
Common mode
Differential mode
CMRR > 80 dB
CMRR > 68 dB
VCM = ±3 V
VOUT = VS ± 10%
G = +21, RF = 1 kΩ, RL open measured at FBx
G = +21, RF = 100 kΩ, RL open measured at FBx
VOUT = 2 V p-p, 60 dB SFDR
Sinking/sourcing
Min Typ
Max Unit
26 MHz
24 MHz
175 MHz
100 V/µs
28 ns
−106/−114
−83/−93
85
5
dBc
dBc
nV/√Hz
nV/√Hz
15
0.1
0.1
±0.25
±8
±0.1
±0.5
106 115
80 µV
1.6 µV/°C
1.0 µV/°C
±1 pA
±25 pA
±0.8 pA
pA
dB
100
2
3
−4.5
−5
92 115
GΩ
pF
pF
+3.8 V
+3.9 V
V
−3.6 to +3.9
−4.7 to +4.8
60
−4.05 to +4.07
−4.9 to +4.86
18
41/45
ns
V
V
mA rms
mA
3.3
90 109
90 109
12 V
dB
dB
Rev. B | Page 4 of 37
5 Page 
ADA4350
Data Sheet
5 V INTERNAL SWITCHING NETWORK AND DIGITAL PINS
TA = 25°C, +VS = 5 V, −VS = 0 V, unless otherwise specified. See Figure 1 for sampling and feedback switches position.
Table 7.
Parameter
FEEDBACK/SAMPLE ANALOG SWITCH
Analog Signal Range
Switch On Resistance
Feedback
Sampling
On-Resistance Match Between Channels
Feedback Resistance
Sampling Resistance
SWITCH LEAKAGE CURRENTS
Sampling and Feedback Switch Off Leakage
DYNAMIC CHARACTERISTICS
Power-On Time
Power-Off Time
Off Isolation
Feedback Switches
Sampling Switches
Channel to Channel Crosstalk
Worst Case Switch Feedback Capacitance (Switch Off )
THRESHOLD VOLTAGES FOR DIGITAL INPUT PINS
Input High Voltage
Input Low Voltage
DIGITAL SUPPLIES
Digital Supply Range
Quiescent Current
+VS to DGND Head Room
Symbol Test Conditions/Comments Min Typ
0
RON, FB
RON, S
S0 to S2, VCM = 2.5 V
TA = 85°C
S3 to S5, VCM = 2.5 V
TA = 85°C
S6 to S8, VCM = 2.5 V
TA = 85°C
S9 to S11, VCM = 2.5 V
TA = 85°C
308
382
308
384
610
762
612
764
ΔRON, FB
ΔRON, S
VCM = 2.5 V
VCM = 2.5 V
3
3
IS (OFF)
TA = 85°C
±0.4
±30
tON
tOFF
CFB (OFF)
VIH
VIL
DVDD = 3.3 V
DVDD = 3.3 V
RL = 50 Ω, f = 1 MHz
RL = 50 Ω, f = 1 MHz
EN, MODE, DGND, LATCH/P0,
SCLK/P1, SDO/P2, SDI/P3, CS/P41
DVDD = 5 V
DVDD = 3.3 V
DVDD = 5 V
DVDD = 3.3 V
DVDD, DGND
Enabled
Disabled
2.0
1.5
3.3
105
65
−93
−116
−83
0.1
50
0.6
≥3.3
Max Unit
5V
390 Ω
Ω
390 Ω
Ω
770 Ω
Ω
770 Ω
Ω
21 Ω
23 Ω
±1.2 pA
±80 pA
ns
ns
dB
dB
dB
pF
V
V
1.4 V
1.0 V
5.5 V
µA
µA
V
1 When referring to a single function of a multifunction pin, only the portion of the pin name that is relevant to the specification is listed. For full pin names of
multifunction pins, refer to the Pin Configuration and Function Descriptions section.
Rev. B | Page 10 of 37
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADA4350.PDF ] | |
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