Datasheet

LMV1089
SNAS441H –SEPTEMBER 2008–REVISED MAY 2010 www.ti.com
OPERATING RATINGS
(1)
Supply Voltage 2.7V ≤ V
DD
≤ 5.5V
I
2
CV
DD
1.7V ≤ I
2
CV
DD
≤ 5.5V
Supply Voltage
(2)
Temperature Range −40°C to 85°C
T
MIN
≤ T
A
≤ T
MAX
−40°C ≤ T
A
≤ +85°C
(1) The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(2) The voltage at I
2
CV
DD
must not exceed the voltage on V
DD
.
ELECTRICAL CHARACTERISTICS 3.3V
(1)
Unless otherwise specified, all limits specified for T
J
= 25°C, V
DD
= 3.3V, V
IN
= 18mV
P-P
, f = 1kHz, EN = V
DD
, pass through
mode
(2)
, Pre Amp gain = 20dB, Post Amp gain = 6dB, R
L
= 100kΩ, and C
L
= 4.7pF, C
REF
= 10nF
LMV1089
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limits
(4)
f = 1kHz, V
IN
= 18mV
P-P
63 dB
SNR Signal-to-Noise Ratio
f = 1kHz, V
IN
= 18mV
P-P
, A-Weighted
65 dB
voice band (300 – 3400Hz)
e
N
Input Referred Noise level A-weighted 5 μV
RMS
V
IN
Maximum Input Signal THD+N < 1%, Pre Amp Gain = 6dB 910 850 mV
P-P
(min)
f = 1kHz, Differential Out+, Out-
Maximum AC Output Voltage 1.2 1.1 V
RMS
(min)
THD+N < 1%
V
OUT
DC Level at Outputs Out+, Out- 800 mV
THD+N Total Harmonic Distortion + Noise Differential Out+ and Out- 0.1 0.2 % (max)
Z
IN
Input Impedance 142 kΩ
Z
OUT
Output Impedance 300 Ω
Load Impedance (Out+, Out-) R
LOAD
10 kΩ (min)
Z
LOAD
C
LOAD
100 pF (max)
A
M
Microphone Preamplifier Gain Range 6 – 36 dB
Microphone Preamplifier Gain 1.7 dB (min)
A
MR
f = 1kHz 2
Adjustment Resolution 2.3 dB (max)
Pass Through Mode and Summing
A
P
Post Amplifier Gain Range 6 – 18 dB
Mode
2.6 dB (min)
A
PR
Post Amplifier Gain Resolution 3
3.4 dB (max)
A
CR
Gain Compensation Range ±3 dB
f = 300Hz 0.5 dB
Maximum Gain Matching Difference
A
MD
f = 1kHz 0.25 dB
After Calibration
f = 3kHz 0.5 dB
Crosstalk Attenuation between Mic1 and
X
Talk
Measured at M1_UNP and M2_UNP 52 41 dB (min)
Mic2
T
CAL
Calibration Duration 790 ms (max)
f = 1kHz (See TEST METHODS) 32 20 dBV(min)
FFNS
E
Far Field Noise Suppression Electrical
f = 300Hz (See TEST METHODS) 37 22 dBV (min)
Signal-to-Noise Ratio Improvement f = 1kHz (See TEST METHODS) 24 14 dBV (min)
SNRI
E
Electrical f = 300Hz (See TEST METHODS) 28 15 dBV (min)
(1) “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating
Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions. All
voltages are measured with respect to the ground pin, unless otherwise specified.
(2) The voltage at I
2
CV
DD
must not exceed the voltage on V
DD
.
(3) Typical values represent most likely parametric norms at T
A
= +25°C, and at the Recommended Operation Conditions at the time of
product characterization and are not specified.
(4) Datasheet min/max specification limits are ensured by test, or statistical analysis.
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