Table 3-7. signal monitoring characteristics, Table 3-8, Cs35l32 – Cirrus Logic CS35L32 User Manual
Page 11
DS963F4
11
CS35L32
3 Characteristics and Specifications
Table 3-7. Signal Monitoring Characteristics
Test conditions, except where noted otherwise: VA = 1.8 V, VP = 3.6 V, VBST = 5.0 V, amp gain = 12 dB, 0.1-
sense resistor, GNDA = GNDP = 0 V,
T
A
= +25°C. Measurement bandwidth is 20 Hz to 20 kHz, Fs = 48 kHz, Input Signal = 1 kHz, MCLK
INT
= 6 MHz, MCLK
INT
is explained in
and
.
Parameters Min
Typical
Max
Units
General ADC characteristics
Power-up time: t
PUP(ADC)
—
8.5
[1]
1.Typical value is specified with PDN_AMP and PDN_xMON bits initially set. Maximum power-up time is affected by the actual MCLK
INT
frequency.
ms
VSENSE± monitoring
characteristics (VMON)
Data width
—
16
—
Bits
Dynamic range (unweighted), VSENSE± = ±5.0 V (10 V
PP
)
—
60
—
dB
2
2.Parameters given in dB are referred to the applicable typical full-scale voltages. Applies to all THD+N and resolution values in the table
Total harmonic distortion + noise, –3.8 dBFS
3
3.VSENSE± THD is measured with the Class D amplifier as the audio source connected to an
8-
+ 33H
speaker load, supplied by a 6.3-V
PP
, 1-kHz
sine wave, operating under the typical performance test conditions to produce a large, unclipped audio signal. This setup produces a –3.8-dBFS
VMON output. Larger Class D amplifier amplitudes begin to exhibit clipping behavior, increasing distortion of the signal supplied to VSENSE±
—
–60
—
dB
Full-scale signal input voltage 6.59•VA 6.94•VA 7.29•VA V
PP
Common-mode rejection ratio (217 Hz @ 500 mV
PP
)
4
4.CMRR test setup for VSENSE±:
—
60
—
Group delay
5
5.VMON group delay is measured from the time a signal is presented on the VSENSE± and pins until the MSB of the digitized signal exits the serial
port. Fs is the LRCK rate.
—
7.6/Fs
—
s
ISENSE± monitoring
characteristics (IMON)
Data width
—
16
—
Bits
Dynamic range (unweighted), ISENSE± = ±0.625 A (1.25 A
PP
)
—
56
—
Total harmonic distortion, –29.5 dBFS
6
6.For reference, injecting a 125-mVpp fully differential sine wave into the ISENSE± pins (equivalent to a ±0.625 A current with a 0.1-
ISENSE resistor)
produces an IMON output of –29.5 dBFS (since typical full-scale is 1.64*VA, in V
PP
). ISENSE± monitoring THD is measured using the Class D
amplifier as the audio source, which is connected to an 8-
+ 33-H speaker load, supplied by a 7.0-V
PP
, 1-kHz sine wave, operating under the
typical performance test conditions to produce a large, unclipped audio signal. This setup produces a –29.5-dBFS amplitude IMON output. Larger
Class D amplifier amplitudes begin to exhibit clipping behavior, increasing the distortion of the signal supplied to ISENSE±.
—
–45
—
dB
Full-scale signal input voltage 1.56•VA 1.64•VA 1.72•VA V
PP
VMON-to-IMON isolation
7
7.
VMON-to-IMON isolation
is the error in the current sense due to VMON, expressed relative to full-scale sense current in decibels.
—
56
—
Group delay
8
8.IMON group delay is measured from when a signal is presented on the ISENSE± pins until the MSB of the digitized signal exits the serial port. Fs is
the LRCK rate.
—
7.6/Fs
—
s
VP monitoring characteristics
Data width
—
8
—
Bits
Voltage resolution (See the equation in
—
35.3
—
mV
(FF code) signal input voltage (VP) 2.89•VA 3.05•VA 3.20•VA
V
VPMON = 1011 0011
VPMON = 1011 0100
…
VPMON = 1111 1111
VPMON = 0000 0000
—
—
…
—
—
2.8
2.835
…
5.482
5.518
—
—
…
—
—
V
V
…
V
V
Table 3-8. Digital Interface Specifications and Characteristics
Test conditions, except where noted otherwise: VA = 1.8 V, VP = 3.6 V, VBST = 5.0 V, GNDA = GNDP = 0 V, T
A
= +25°C.
Parameters
Symbol
Test Conditions
Min
Max
Units
Input leakage current (per pin)
1,2
1.Specification includes current through internal pull up/down resistors, where applicable (as defined in
).
2.Leakage current is measured with VA = 1.80 V, VP = 3.60 V, VBST = 3.60 V, and RESET asserted. Each pin is tested while driven high and low.
FLOUT2/AD0
FLEN, FLINH, LRCK
MCLK, SCLK, SDOUT
SCL, SDA, INT, RESET
I
IN
—
—
—
—
—
—
—
—
±7.5
±4.5
±4.5
±0.1
A
A
A
A
Input capacitance
I
IN
—
—
10
pF
VA logic I/Os
High-level output voltage
V
OH
I
OH
= –67/–100
A
3
3.For the ADSP output SDOUT and potential outputs SCLK and LRCK (if M/S = 1), if ADSP_DRIVE = 0 see
, I
OH
and I
OL
are –100 and
+100
A. If ADSP_DRIVE = 1, I
OH
and I
OL
are –67 and +67
A. For other, non-ADSP_DRIVE-affected outputs, I
OH
and I
OL
are –100 and +100
A.
VA–0.2
—
V
Low-level output voltage
V
OL
All outputs, I
OL
= 67/100
A
INT, SDA, I
OL
= 3 mA
—
—
0.20
0.4
V
V
High-level input voltage
V
IH
— 0.70•VA
—
V
Low-level input voltage
V
IL
—
—
0.30•VA
V
VSENSE+
217 Hz
500 mV
PP
DC Offset = 0
VSENSE–