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LT1167I Datasheet

  • LT1167I

  • Linear Technology [Single Resistor Gain Programmable, Preci...

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LT1167
APPLICATIONS INFORMATION
+IN
3
8
V
S
+
7
6
REF
5
V
X
I
L
R
X
R
G
1
鈥揑N
2
LT1167
鈥?/div>
4
2
鈥揤
S
1
1/2
LT1464
3
[(+IN) 鈥?(鈥揑N)]G
V
I
L
=
X
=
R
X
R
X
G=
49.4k鈩?/div>
+1
R
G
LOAD
1167 F07
Figure 7. Precision Voltage-to-Current Converter
Nerve Impulse Amplifier
The LT1167鈥檚 low current noise makes it ideal for high
source impedance EMG monitors. Demonstrating the
LT1167鈥檚 ability to amplify low level signals, the circuit in
Figure 8 takes advantage of the amplifier鈥檚 high gain and
low noise operation. This circuit amplifies the low level
nerve impulse signals received from a patient at Pins 2
and 3. R
G
and the parallel combination of R3 and R4 set
a gain of ten. The potential on LT1112鈥檚 Pin 1 creates a
ground for the common mode signal. C1 was chosen to
maintain the stability of the patient ground. The LT1167鈥檚
high CMRR ensures that the desired differential signal is
amplified and unwanted common mode signals are at-
tenuated. Since the DC portion of the signal is not
3V
3
8
R3
30k
R4
30k
2
PATIENT/CIRCUIT
PROTECTION/ISOLATION
+IN
C1
0.01碌F
R2
1M
R1
12k
R
G
6k
1
2
PATIENT
GROUND
1
1/2
LT1112
3
A
V
= 101
POLE AT 1kHz
鈥揑N
Figure 8. Nerve Impulse Amplifier
16
U
鈥?/div>
+
W
鈥?/div>
+
U
U
important, R6 and C2 make up a 0.3Hz highpass filter.
The AC signal at LT1112鈥檚 Pin 5 is amplified by a gain of
101 set by (R7/R8) +1. The parallel combination of C3
and R7 form a lowpass filter that decreases this gain at
frequencies above 1kHz. The ability to operate at
鹵3V
on
0.9mA of supply current makes the LT1167 ideal for
battery-powered applications. Total supply current for
this application is 1.7mA. Proper safeguards, such as
isolation, must be added to this circuit to protect the
patient from possible harm.
Low I
B
Favors High Impedance Bridges,
Lowers Dissipation
The LT1167鈥檚 low supply current, low supply voltage
operation and low input bias currents optimize it for
battery-powered applications. Low overall power dissi-
pation necessitates using higher impedance bridges. The
single supply pressure monitor application (Figure 9)
shows the LT1167 connected to the differential output of
a 3.5k bridge. The bridge鈥檚 impedance is almost an order
of magnitude higher than that of the bridge used in the
error-budget table. The picoampere input bias currents
keep the error caused by offset current to a negligible
level. The LT1112 level shifts the LT1167鈥檚 reference pin
and the ADC鈥檚 analog ground pins above ground. The
LT1167鈥檚 and LT1112鈥檚 combined power dissipation is
still less than the bridge鈥檚. This circuit鈥檚 total supply
current is just 2.8mA.
+
7
C2
0.47碌F
LT1167
G = 10
5
6
0.3Hz
HIGHPASS
3V
5
R6
1M
+
鈥?/div>
8
1/2
LT1112
4
鈥?V
7
OUTPUT
1V/mV
6
鈥?/div>
4
鈥?V
R8
100鈩?/div>
R7
10k
C3
15nF
1167 F08

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