Le79228
Data Sheet
No.
Item
Insertion Loss
A-D, D-A
Condition
Min
Typ
Max
Unit
Note
Input: 1014Hz, 0dBm0
AR = AX = GR = GX = 0 dB,
DISN, R, X, B and Z disabled
–0.25
0
+0.25
1
Temperature = 25°C
Variation over temperature
A-D AX + GX
D-A AR + GR
DR Input: 1014 Hz, –10 dBm0
AR=AX=GR=GX=0 dB, DISN,
R, X, B and Z filters default
–0.15
–0.1
0
0
+0.15
+0.1
A-D + D-A
dB
3., 7.
Level set error (Error between
setting and actual value)
2
3
–0.1
0
0.1
DR to DX gain in full digital
loopback mode
–0.3
0
+0.3
A-D (PCM output)
—
—
—
—
–7
—
—
—
—
0
–69
–78
+19
+12
+7
Idle Channel Noise,
4
5
dBm0p
Psophometric Weighted (A-law)
D-A (VOUT
A-D (PCM output)
D-A (VOUT
)
5.
2.
Idle Channel Noise,
C Message weighted (µ-law)
dBrnC0
Bits
)
6
7
Coder Offset decision value, Xn A-D, Input signal = 0 V
PSRR Image frequency (VCC)
A-D
PSRR Image frequency (VCC)
D-A
Input: 4.8 to 7.8 kHz,
200 mVp-p
Measure at:
8000 Hz − Input frequency
Gdisn = –0.9375 to 0.9375
Vin = 0 dBm0
1014Hz; –10dBm0
B = Z = 0; X = R = 1
37
37
—
—
—
—
dB
8
9
1
DISN gain accuracy
+0.2
—
dB
µS
2., 6.,
8.
10
11
12
End-to-end group delay
—
525
–75
0 dBm0
0 dBm0
0 dBm0
0 dBm0
300 Hz to 3400 Hz
300 Hz to 3400 Hz
1014 Hz
—
—
—
—
—
—
—
—
Crosstalk
TX to RX
dBm0
dBm0
same channel RX to TX
2.
–76
–78
Crosstalk
TX or RX to TX
other channel TX or RX to RX
1014 Hz
Notes:
1. Not tested or partially tested in production. This parameter is guaranteed by characterization or correlation to other tests.
2. Guaranteed by design.
3. Overall 1.014 kHz insertion loss error of the Le79228 Quad ISLAC device is guaranteed to be 0.34 dB
4. These voltages are referred to VREF.
5. When relative levels (dBm0) are used, the specification holds for any setting of (AX + GX) gain from 0 to 12 dB or (AR + GR) from 0 to –12
dB.
6. Group delay spec valid only when Channels 1–4 occupy consecutive slots in the frame. Programming channels in non-consecutive timeslots
can add up to 1 frame delay in the Group delay measurements. The Group delay specification is defined as the sum of the minimum values
of the group delays for transmit and the receive paths when the B, X, R, and Z filters are disabled with null coefficients. See Figure 5, on
page 16.
7. Requires that the calibration command (7Ch) must be performed to achieve this performance.
8. An additional frame of delay can be added if PCLK frequencies less than 1.536 MHz are used.
9. In the absence of any error, the analog level of VREF + 1.02 V represents a digital code of 7FFFh, and the analog level of VREF - 1.02 V
represents a digital code of 8000h.
Transmit and Receive Paths
In this section, the transmit path is defined as the analog input to the Le79228 Quad ISLAC device (VINn) to the PCM voice output
of the Le79228 Quad ISLAC device A-law/µ-law speech compressor. The receive path is defined as the PCM voice input to the
Le79228 Quad ISLAC device speech expander to the analog output of the Le79228 Quad ISLAC device (VOUTn). All limits
defined in this section are tested with B = 0, Z = 0 and X = R = GR = 1.
When AR is enabled, a nominal gain of –6.02 dB is added to the analog section of the receive path.
When AX is enabled, a nominal gain of +6.02 dB is added to the analog section of the transmit path.
When relative levels (dBm0) are used in any of the following transmission characteristics, the specification holds for any setting
of (AX + GX) gain from 0 to 12 dB or (AR + GR) from 0 to –12 dB.
14
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
