Cirrus Logic CS470xx - Manual (Page 21)

21 DS787PP9
5.15 Digital Switching Characteristics–S/PDIF RX Port
5.15 Digital Switching Characteristics–S/PDIF RX Port
(Inputs: Logic 0 = V
IL
, Logic 1 = V
IH
, C
L
= 20 pF)
5.16 ADC Characteristics
5.16.1 Analog Input Characteristics (Commercial)
Test Conditions (unless otherwise specified): T
A
= 0–+70°C; VDD = 1.8V±5%, VDDA (VA) = 3.3V±5%, 1kHz sine wave
driven through the passive input filter (R
i
= 10 k ) in Fig. 5-13 or Fig. 5-14 ; DSP running test application; Measurement
Bandwidth is 10–20kHz.
1. dB units referred to the typical full-scale voltage.
2. These full-scale values were measured with R
i
=10k for both the single-ended and differential mode input circuits.
3. The full-scale voltage can be changed by scaling R
i
.
Differential Full-Scale (Vpp) = 3.7*VDDA*(Ri+200)/(10k+200)
Single-Ended Full-Scale (Vpp) = 1.85*VDDA*(Ri+200)/(10k+200)
4. Measured between AIN_xx+ and AN_xx–.
5. Measured between AIN_xx+ and AGND.
6. Decreasing full-scale voltage by reducing R
i
causes the noise floor to increase.
7. Common mode input current should be kept to less than ±160uA to avoid performance degradation: |(I
ip
+I
in
)/2| < 160uA. This corresponds to ±1.6V
for R
i
=10 k  in the differential case.
8. This number was measured using perfectly matched external resistors (R
i
). Mismatch in the external resistors typically reduces CMRR by 20 log
(|

R
i
|/R
i
+ 0.001).
9. C
L
represents the parasitic load capacitance between R
i
on the input circuit and the input pin of the CS47048 package.
10. This measurement is not applicable to the CS47028 and CS47024 devices.
Parameter Symbol Min Typ Max Units
PLL Clock Recovery Sample Rate Range — 30 — 200 kHz
Differential Single-ended
Parameter Min Typ Max Min Typ Max Unit
Fs = 96 kHz
Dynamic Range
1,6,7
A-weighted
Unweighted
40 kHz bandwidth unweighted 99
96
—
105
102
99
—
—
— 96
93
—
102
99
96
—
—
— dB
dB
dB
Total Harmonic Distortion + Noise 6,7
–1 dB
–20 dB
–60 dB
40 kHz bandwidth –1 dB —
—
—
— –98
–82
–42
–90 –92
—
—
—
—
—
—
— –95
–79
–39
–90 –89
—
—
—
dB
dB
dB
dB
AIN_1A/B Interchannel Isolation 10 — 95 — — 95 — dB
AID_[2.6]A/B MUX Interchannel Isolation — 95 — — 95 — dB
DC Accuracy
Interchannel Gain Mismatch — 0.1 — — 0.1 — dB
Gain Drift — ±120 — — ± 120 — ppm/°C
Analog Input
Full-scale Input Voltage 2,3 3.3 3.7 • VA 3.9 1.65 1.85 • VA 1.95 V
PP
Differential Input Impedance 4 — 400 — — — —

Single-ended Input Impedance 5 — — — — 200 — 
Common Mode Rejection Ratio (CMRR) 8 — 60 — — — — dB
Parasitic Load Capacitance (C
L
) 9 — — 20 — — 20 pF