LTC6911-1/LTC6911-2
9
sn691112 691112fs
The ● denotes the specifications that apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R
L
= 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 1V
RMS
and measuring
the output voltage RMS of the other channel relative to AGND with its
input tied to AGND. Isolation is calculated:
Isolation
V
V
Isolation
V
V
A
OUTB
OUTA
B
OUTA
OUTB
==20 20
10 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 ● 10 10 Ω
R
INA
– R
INB
Gain = 2 ● 55Ω
Gain = 4
● 22Ω
Gain > 4
● 11Ω
DC Small-Signal Output Resistance DC V
INA
or V
INB
= 0V
at OUTA or OUTB Pins Gain = 0 0.4 0.4 Ω
Gain = 1 0.7 0.7 Ω
Gain = 2 1.0 1.0 Ω
Gain = 4 1.9 1.9 Ω
Gain = 8 3.4 3.4 Ω
Gain = 16 6.4 6.4 Ω
Gain = 32 15 15 Ω
Gain = 64 30 30 Ω
Wideband Noise (Referred to Input) f = 1kHz to 200kHz
Gain = 0 (Output Noise Only) 7.4 7.4 µV
RMS
Gain = 1 12.4 12.4 µV
RMS
Gain = 2 8.5 8.5 µV
RMS
Gain = 4 6.5 6.5 µV
RMS
Gain = 8 5.5 5.5 µV
RMS
Gain = 16 5.2 5.2 µV
RMS
Gain = 32 4.9 4.9 µV
RMS
Gain = 64 4.3 4.3 µV
RMS
Voltage Noise Density f = 50kHz
(Referred to Input) Gain = 1 28.0 28.0 nV/√Hz
Gain = 2 19.0 19.0 nV/√Hz
Gain = 4 14.8 14.8 nV/√Hz
Gain = 8 12.7 12.7 nV/√Hz
Gain = 16 11.8 11.8 nV/√Hz
Gain = 32 11.5 11.5 nV/√Hz
Gain = 64 10.9 10.9 nV/√Hz
Total Harmonic Distortion Gain = 8, f
IN
= 10kHz, V
OUT
= 1V
RMS
–90 –90 dB
0.003 0.003 %
Gain = 8, f
IN
= 100kHz, V
OUT
= 1V
RMS
–82 –82 dB
0.008 0.008 %
Gain-Bandwidth Product Gain = 64, f
IN
= 200kHz ● 6 11 17 6 11 17 MHz
