
LTC6911-1/LTC6911-2
9
sn691112 691112fs
The q denotes the specifications that apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), RL = 10k
to midsupply point, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC6911C and LTC6911I are guaranteed functional over the
operating temperature range of – 40
°C to 85°C. The LTC6911H is
guaranteed functional over the operating temperature range of – 40
°C to
125
°C.
Note 3: The LTC6911C is guaranteed to meet specified performance from
0
°C to 70°C. The LTC6911C is designed, characterized and expected to
meet specified performance from – 40
°C to 85°C but is not tested or QA
sampled at these temperatures. LTC6911I is guaranteed to meet specified
performance from – 40
°C to 85°C. The LTC6911H is guaranteed to meet
specified performance from –40
°C to 125°C.
Note 4: Output voltage swings are measured as differences between the
output and the respective supply rail.
Note 5: Extended operation with output shorted may cause junction
temperature to exceed the 150
°C limit and is not recommended.
Note 6: Gain is measured with a DC large-signal test using an output
excursion between approximately 30% and 70% of the total supply
voltage.
Note 7: Channel-to-channel isolation is measured by applying a 200kHz
input signal to one channel so that its output varies 1VRMS and measuring
the output voltage RMS of the other channel relative to AGND with its
Isolation
V
Isolation
V
A
OUTB
OUTA
B
OUTA
OUTB
==
20
10
log
,
log
Note 8: Offset voltage referred to the INA or INB input is (1 + 1/G) times
the offset voltage of the internal op amp, where G is the nominal gain
magnitude. See Applications Information.
Note 9: Input resistance can vary by approximately
±30% part-to-part at a
given gain setting (input resistance match remains as specified).
C/I GRADES
H GRADE
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
LTC6911-2 Only
DC Input Resistance Match
Gain = 1
q
10
RINA – RINB
Gain = 2
q
55
Gain = 4
q
22
Gain > 4
q
11
DC Small-Signal Output Resistance
DC VINA or VINB = 0V
at OUTA or OUTB Pins
Gain = 0
0.4
Gain = 1
0.7
Gain = 2
1.0
Gain = 4
1.9
Gain = 8
3.4
Gain = 16
6.4
Gain = 32
15
Gain = 64
30
Wideband Noise (Referred to Input)
f = 1kHz to 200kHz
Gain = 0 (Output Noise Only)
7.4
VRMS
Gain = 1
12.4
VRMS
Gain = 2
8.5
VRMS
Gain = 4
6.5
VRMS
Gain = 8
5.5
VRMS
Gain = 16
5.2
VRMS
Gain = 32
4.9
VRMS
Gain = 64
4.3
VRMS
Voltage Noise Density
f = 50kHz
(Referred to Input)
Gain = 1
28.0
nV/
√Hz
Gain = 2
19.0
nV/
√Hz
Gain = 4
14.8
nV/
√Hz
Gain = 8
12.7
nV/
√Hz
Gain = 16
11.8
nV/
√Hz
Gain = 32
11.5
nV/
√Hz
Gain = 64
10.9
nV/
√Hz
Total Harmonic Distortion
Gain = 8, fIN = 10kHz, VOUT = 1VRMS
–90
– 90
dB
0.003
%
Gain = 8, fIN = 100kHz, VOUT = 1VRMS
–82
– 82
dB
0.008
%
Gain-Bandwidth Product
Gain = 64, fIN = 200kHz
q
6
11
17
6
11
17
MHz