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PDF MAX4209 Data sheet ( Hoja de datos )
| Número de pieza | MAX4209 | |
| Descripción | (MAX4208 / MAX4209) Precision Instrumentation Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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www.DataSheet4U.com
19-0924; Rev 0; 9/07
EVAALVUAAILTAIOBNLEKIT
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
General Description
The MAX4208/MAX4209 ultra-low offset and drift instru-
mentation amplifiers feature exceptional precision specifi-
cations, low power consumption, rail-to-rail output,
excellent gain-bandwidth product, and buffered
REFIN/MODE input in a very small µMAX® package.
These devices use a patented† spread-spectrum,
autozeroing technique that constantly measures and
corrects the input offset, eliminating drift over time and tem-
perature and the effect of 1/f noise. This technique
achieves less than 20µV offset voltage, allows ground-
sensing capability, provides ultra-low CMOS input bias cur-
rent and increased common-mode rejection performance.
The MAX4208/MAX4209 provide high-impedance inputs
optimized for small-signal differential voltages (±100mV).
All devices provide a gain-bandwidth product of 750kHz.
The MAX4208 provides an adjustable gain with two
external resistors or unity gain with FB connected to OUT.
The MAX4209 is available in fixed gains of 10V/V, 100V/V,
or 1000V/V (suffixed T, H, and K) with ±0.03% (typ) accu-
racy. Both devices include a reference input (REF) to
level-shift the output, allowing for bipolar signals in single-
supply applications. In both devices, REFIN/MODE is an
input to a precision unity-gain buffer, which sets the REF
voltage to level-shift the output. The internal REF buffer
allows the reference to be set by a simple resistive divider
or an ADC reference without any loading error.
The MAX4208/MAX4209 operate with a 2.85V to 5.5V
single-supply voltage and consume only 750µA
of quiescent current (when the internal buffer is off) and
only 1.4µA in shutdown mode. These amplifiers
also operate with ±2.5V dual supplies with REF
connected to ground and REFIN/MODE to VSS.
The MAX4208/MAX4209 are available in space-saving
8-pin µMAX packages and are specified over the auto-
motive operating temperature range (-40°C to +125°C).
†Patent pending.
Applications
Automotive Transducer Applications
Strain-Gauge Amplifiers
Industrial Process Control
Battery-Powered Medical Equipment
Precision Low-Side Current Sense
Notebook Computers
Differential Voltage Amplification
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
♦ Ultra-Low Input Offset Voltage
±20µV (max) at +25°C
♦ ±0.25% (max) Gain Error
♦ Low 0.2µV/°C Offset Voltage Drift
♦ 1pA CMOS Input Bias Current
♦ True Ground Sensing with Rail-to-Rail Output
♦ Buffered REF Input for High Accuracy and
Bipolar Operation
♦ 2.85V to 5.5V Single-Supply Operation
(or ±1.425V to ±2.75V Dual Supplies)
♦ 750µA Supply Current
♦ 1.4µA Shutdown Mode
♦ 750kHz Gain-Bandwidth Product
♦ Operate Over the -40°C to +125°C Automotive
Temperature Range
♦ Tiny 8-Pin µMAX Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
GAIN
(V/V)
MAX4208AUA+T
-40°C to +125°C 8 µMAX-8
ADJ
MAX4209TAUA+T* -40°C to +125°C 8 µMAX-8
10
MAX4209HAUA+T -40°C to +125°C 8 µMAX-8
100
MAX4209KAUA+T* -40°C to +125°C 8 µMAX-8 1000
Note: All 8-pin µMAX packages have package code U8-1.
+Denotes a lead-free package.
*Future product—contact factory for availability.
Typical Application Circuit
5V
R4
VDD/2
R3
MAX4208
G = 1 + R2
R1
IN-
IN+ VDD
REFIN/MODE
REF VSS
FB
OUT
R2 CFB
FB
R1
REF BUFFER OUT =
VDD/2
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, VREFIN/MODE = VSS, RL = 100kΩ to VDD/2, VDIFF = (VIN+ - VIN-) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), TA = -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
-20mV ≤ VDIFF ≤
+20mV (MAX4208),
G = 100V/V
TA = -40°C to
+125°C
MIN TYP MAX UNITS
50 180
Gain Error Temperature Drift
(Note 2)
-100mV ≤ VDIFF ≤
+100mV (MAX4209T),
G = 10V/V
-20mV ≤ VDIFF ≤
+20mV (MAX4209H),
G = 100V/V
TA = -40°C to
+125°C
TA = -40°C to
+125°C
50
ppm/°C
50 180
-2mV ≤ VDIFF ≤ +2mV
(MAX4209K),
G = 1000V/V
TA = -40°C to
+125°C
100
Gain Nonlinearity
(Note 2)
MAX4208,
TA = +25°C to +85°C
G = 100V/V
TA = -40°C to +125°C
GNL
MAX4209H, TA = +25°C to +85°C
G = 100V/V
TA = -40°C to +125°C
210
700
ppm
210
700
Input Common-Mode Range
VCM
Guaranteed by CMRR test,
TA = -40°C to +125°C
VSS -
0.1
VDD -
1.6
V
Input Common-Mode Rejection
Ratio
CMRR
(VSS - 0.1V) ≤ VCM ≤
(VDD - 1.6V)
TA = +25°C to +85°C
TA = -40°C to
+125°C
96
90
dB
Power-Supply Rejection Ratio
PSRR
VDD = 2.85V to 5.5V, TA = +25°C to +85°C
VREF = VCM = VSS + TA = -40°C to
0.5V
+125°C
96
90
dB
REFIN/MODE AND REF DC CHARACTERISTICS
REFIN/MODE Buffer Input
Offset Voltage
TA = +25°C to +85°C
TA = -40°C to +125°C
100
µV
100
REFIN/MODE Buffered
Reference Input Range
VREFIN/MODE
Reference buffer is ON, guaranteed by
REFIN/MODE CMRR test
VSS +
0.2
VDD -
1.6
V
REFIN/MODE Input-Voltage
Low
VIL Reference buffer is OFF
VSS +
0.05
V
_______________________________________________________________________________________ 5
5 Page 
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Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
MAX4208
VDD
AMP
IN-
gm
IN+
gm
OUT
R2
FB
R1
REF
MAX4209
IN-
gm
IN+
VDD
AMP
R2
gm R1
OUT
FB
REF
+1 REFIN/MODE
+1 REFIN/MODE
SHDN
G
=
1
+
R2
R1
VSS
Figure 1. MAX4208 Functional Diagram
SHDN
G
=
1
+
R2
R1
VSS
Figure 2. MAX4209 Functional Diagram
Detailed Description
The MAX4208/MAX4209 family of instrumentation ampli-
fiers implements a patented spread-spectrum, autozero-
ing technique that minimizes the input offset error, drift
over time and temperature, and the effect of 1/f noise.
Unlike the traditional three-op amp instrumentation
amplifier, this technique allows true ground-sensing
capability combined with a low input bias current and
increased common-mode rejection.
The differential input signal is converted to a current by
an input transconductance stage. An output transcon-
ductance stage converts a portion of the output voltage
(equal to the output voltage divided by the gain) into
another precision current. These two currents are sub-
tracted and the result is fed to a loop amplifier with suffi-
cient gain to minimize errors (Figures 1 and 2). The
MAX4209 has factory-trimmed gains of 10V/V, 100V/V,
and 1000V/V. The MAX4208 has an adjustable gain, set
with an external pair of resistors between OUT, FB, and
REF (Figure 1). The MAX4208/MAX4209 have an output
reference input (REF) that is connected to an external ref-
erence for bipolar operation of the device. For single-sup-
ply operation, the range for VREF is 0V to (VDD - 1.3V).
Although full output-swing capability and maximum sym-
metrical dynamic range is obtained at REF = VDD/2, the
optimal VREF setting depends on the supply voltage and
output-voltage swing needed by the application. The
maximum recommended differential input voltage is
±100mV. Linearity and accuracy are degraded above
that level. The MAX4208/MAX4209 operate with single
2.85V to 5.5V supply voltages or dual ±1.425V to ±2.75V
supplies.
The MAX4208/MAX4209 have a shutdown feature to
reduce the supply current to 1.4µA (typ) when REFIN/
MODE is connected to VDD.
REF, REFIN/MODE, and Internal REFIN
Buffer of the MAX4208/MAX4209
In a single-supply system, bipolar operation of an
instrumentation amplifier requires the application of a
voltage reference (REF) to set the output voltage level
when a zero differential voltage is applied to the input.
The output swing is around this reference level, which
is usually set to half of the supply voltage for the largest
swing and dynamic range.
In many instrumentation amplifiers, the gain-setting
resistors as well as the RL are connected between OUT
and REF. OUT can sink and source current but the
need for REF to sink and source current is often over-
looked and can lead to significant errors. Therefore, the
MAX4208/MAX4209 include a REFIN buffer, an internal,
precision unity-gain buffer on-chip to sink and source the
currents needed at REF without loading the reference
voltage supplied at REFIN/MODE.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX4209.PDF ] | |
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