SAA7371 Datasheet, PDF (47/60 Pages) NXP Semiconductors – Digital servo processor and Compact Disc decoder CD7

Philips Semiconductors
Digital servo processor and
Compact Disc decoder (CD7)
Product specification
SAA7371
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Digital input/output
INPUT/OUTPUT: SDA [CMOS INPUT/OPEN-DRAIN I²C-BUS OUTPUT (WITH PROTECTION DIODE TO V_DD)]
V_IL
LOW level input voltage
−0.3
−
0.3V_DD V
V_IH
HIGH level input voltage
0.7V_DD −
V_DD + 0.3 V
I_ZO
3-state leakage current
V_i = 0 − V_DD
−10
−
+10
µA
C_in
input capacitance
−
−
10
pF
V_OL
LOW level output voltage
I_OL = 2 mA
0
−
0.4
V
I_o
output current
−
−
4
mA
C_L
load capacitance
−
−
50
pF
t_f
output fall time
C_L = 20 pF;
−
−
15
ns
(V_DD − 0.8) − 0.8
Crystal oscillator
INPUT: CRIN (EXTERNAL CLOCK)
V_IL
LOW level input voltage
V_IH
HIGH level input voltage
I_LI
input leakage current
C_I
input capacitance
−0.3
−
0.7V_DD −
−10
−
−
−
0.3V_DD V
V_DD + 0.3 V
+10
µA
10
pF
OUTPUT: CROUT; see Figs 3 and 4
f_xtal
crystal frequency
note 7
8
g_m
mutual conductance at 100 kHz
−
G_V
small signal voltage gain
G_V = g_m × R_O
−
C_fb
feedback capacitance
−
C_out
output capacitance
−
8.4672 35
10
−
18
−
−
5
−
10
MHz
mA/V
V/V
pF
pF
Notes
1. Highest clock frequency at which data slicer produces 1010 output in analog self-test mode.
2. V_RL = 0 V, f_sys = 4.2336 MHz. The maximum input current depends on the value of the external resistor connected
to I_refT:
a) For D1 to D4: I_max = 2.4/R_IrefT ⇒ 2.4/220 kΩ = 10.9 µA.
b) For R1 and R2:I_max = 1.2/R_IrefT ⇒ 1.2/220 kΩ = 5.45 µA.
3. Internal reference source with 32 different output voltages. Selection is achieved during a calibration period or via
the serial interface. The values given are for an unloaded V_RH.
4. V_RH = 2.5 V and V_RL = 0 V, measuring bandwidth: 200 Hz to 20 kHz, f_i(ADC) = 1 kHz.
5. f_ripple = 1 kHz, V_ripple = 0.5 V (p-p).
6. Gain of the ADC is defined as G_ADC = f_sys/I_max (counts/µA); thus digital output = I_i × G_ADC where:
a) Digital output = the number of pulses at the digital output in counts/s and I_i = the DC input current in µA.
b) The maximum input current depends on the system frequency (f_sys = 4.2336 MHz) and on V_RH − V_RL.
c) The gain tolerance is the deviation from the calculated gain regarding note 2.
7. It is recommended that the series resistance of the crystal or ceramic resonator is ≤60 Ω.
1998 Jul 06
47