Page 1
For Video Equipment
MN88831
PCM Audio Decoder LSI for Satellite Broadcasting Tuners
(Includes Built-In Digital Filter and D/A Converter)
Pin Assignment Overview
The MN88831 greatly streamlines set design by incorporating a satellite broadcasting PCM audio decoder, a
switched capacitor D/A converter, and analog post filter
to a single chip.
Features
Built-in digital filter using 8-fold oversampling
Built-in tertiary ∆-∑ noise shaping D/A converter
Reduced jitter noise through use of switched
capacitor configuration
Built-in analog post filter
Built-in digital de-emphasis circuit
Choice of microcomputer interfaces with selector pin:
3-wired serial interface or I
Muting function supporting following settings
• Pay-per-view flag detection
• Error frequency detection
• Detection of control code bit-7
Built-in general-purpose microcomputer I/O port
Bit stream input pin supporting 0.4 V
2
C interface
P-P
input
DV
PO1
PO2
PO3
PO4
PC
IV
IV
XO
IIN
OIN
SS
I
O
XI
PO0/MTO
PI2
PI1
DVDDBSTIN
BSTRM
3635343332313029282726
37
38
39
40
41
42
43
44
45
46
47
48
1234567891011
DD
PO5
TES0
IFSEL
PO6/LIBP
TES1
DV
(TOP VIEW)
SYNCF
DCDI
ECDO
P2M
CHV
CS/SA
CCK/SCL
CWO/IFMOD
NAMODE
BPO
25
24
23
22
21
20
19
18
17
16
15
14
13
12
SS
DV
CTLI/SDA
NTI
NLOCK
NRES
DV
SS
AV
DDR
V
REF
OUTR
AV
SSR
BIAS
AV
SSL
OUTL
AV
DDL
Applications
Satellite broadcasting tuners (BS, CS)
QFP048-P-1212A
Page 2
MN88831 For Video Equipment
Block Diagram
BIAS
V
REF
BPO
MTI
IV
IV
16
19
18
OUTR
14
OUTL
Digital filter
Digital de-emphasis
∆–Σ noise shaper
Switched capacitor D/A
converter
Analog post filter
25
for
Timing generator
D/A converter block
(D/A converter block)
3
PO6/LIBP
PO1 to PO5
C bus
2
Serial or I
VCO
34,35
36
8
11
10
9
4
26
27
7
41
46
45
47
48
PO0/MTO
PI1,PI2
CWO/IFMOD
CTLI/SDA
CCK/SCL
CS/SA
IFSEL
NAMODE
P2M
CHV
PC
XO
XI
IIN
QIN
Data output control
Digital audio interface
24
A mode data expansion
Incompatible data range detection
Data interpolation
Muting
(
MTO
(
LIBP
)
)
Microcomputer interface:
De-interleaving
44
O
Descramble control code
integration and detection
43
I
Range bit detection and
correction.
)
DE
(
Pay-per-view flag detection
Clock generator
SW1
SW2
Duplex error
detection and
correction
Frame synchronization
detection
Timing generator
29
28
23
30
1 T
Differential decoder
serialization
22
31
32
ECDI
ECDO
SYNCF
NLOCK
BSTRM
NRES
BSTIN
Page 3
For Video Equipment MN88831
Absolute Maximum Ratings
Parameter Symbol Ratings Unit
Power supply voltage V
Input voltage V
Output voltage V
Output current I
Power dissipation P
Operating temperature T
Storage temperature T
DD
I
O
O
D
opr
stg
Notes:
1. The above ratings represent the maximum values that may be applied without damaging the chip, not the limits for guaranteed
operation.
2. If the chip is to be used in the presence of strong electric fields—under a CRT tube, for example—apply shielding to the package
surface to ensure proper operation.
3. The power dissipation is for an ambient temperature (Ta) of 70˚C.
4. The voltages applied to the pins CCK/SCL, CTLI/SDA, CWO/IFMOD, PO0/MTO, PO1–PO5, and PO6/LIBP must be within
the range between –0.3V and 5.5V when the power is off.
– 0.3 to 7.0 V
– 0.3 to VDD +0.3 V
– 0.3 to VDD +0.3 V
25 mA
480 mW
–20 to +70 ˚C
–55 to +125 ˚C
Operating Conditions DV
=AVSS=0V
SS
Parameter Symbol Test Conditions min typ max Unit
Power supply voltage for DV
(*1) 4.5 5.0 5.5 V
DD
digital circuits
Power supply voltage for AV
(*2) 4.5 5.0 5.5 V
DD
analog circuits
XI clock frequency f
XI clock frequency f
CHV="H" (256fs mode) 12.288 MHz
XI
CHV="L" (384fs mode) 18.432 MHz
XI
XI clock input amplitude — C cut input 0.8 3.0 V
BSTIN input amplitude — C cut input 0.35 0.5 V
Ambient temperature during Ta –20 +70 ˚C
operation
Notes:
1. *1 & *2:
For the logic portions of the microcomputer interface, DV
AV
covers both AV
DD
covers both AV
AV
SS
Analog characteristics are only guaranteed for DV
DDL
and AV
SSL
and AV
SSR
DDR
.
.
DD
2. Always use low-impedance external connections for V
Always connect the two through a bypass capacitor of at least 0.01 µF to ensure proper operation.
min = 4.0V.
DD
= AVDD = 5.0V.
and V
DD
.
SS
P-P
P-P
3. Keep the NRES pin (pin No. 22) at "L" level to prevent operation error of the CTLI/SDA pin in the I
lower than the guaranteed operating power supply voltage.
2
C interface at voltages
Page 4
MN88831 For Video Equipment
Electrical Characteristics
(1) DC characteristics
AVDD=DVDD=4.5 to 5.5V, AVSS=DVSS=0V, Ta= –20 to +70˚C
Parameter Symbol Test Conditions min typ max Unit
I
Power supply current
I
Digital input pins 1 (*1)
"H" level input voltage V
"L" level input voltage V
Digital input pins 2 (*2)
"H" level input voltage V
"L" level input voltage V
Digital output pins 1 (*3)
"H" level output voltage V
"L" level output voltage V
Digital output pins 2 (*4)
"L" level output voltage V
High-impedance output
leakage current VI=0V to DV
I
Digital output pins 3 (*5)
"L" level output voltage V
High-impedance output
leakage current V
I
Analog output pins
VREF pin output pin V
BIAS pin output pin V
IVI-IVO inverter
Inverter input threshold
voltage
Notes:
*1: IFSEL, TES0, TES1, CHV, MTI, ECDI, PI1, PI2, IIN, QIN, CWO/IFMOD (C3, C4 only), IVI (C5 only)
V
No load, VDD=5.5V
DD1
384fs
No load, VDD=5.5V
DD2
256fs
IH1
IL1
IH2
IL2
OH1IOH1
OL1IOL1
OL2IOL2
VO=
LO
OL3IOL3
VI=0V to DV
LO2
REF
BIAS
TI
56 80 mA
56 80 mA
= –1mA
0.7 × DV
0.8 × DV
DV
DV
DD
SS
DD
SS
DVDD – 0.8
DV
DD
0.3 × DV
DV
DD
0.2 × DV
DD
DD
=+1mA 0.5 V
=+1mA 0.5 V
High-impedance state
DD
±10 µA
=+1mA 0.5 V
=0V to 0.5V
NRES
DD
0.45 × AV
0.5 × AV
0.5
×
DVDD ± 0.75 V
±50 µA
DD
DD
V
V
V
V
V
V
V
*2: CS/SA, CCK/SCL, NRES, CTLI/SDA (C6, C7 only)
*3: NLOCK, BPO, NAMODE, P2M, ECDO, SYNCF, BSTRM, PC
*4: PO0/MTO, PO1 to PO6, CWO/IFMOD, PC (C12 only)
*5: CTLI/SDA
Page 5
For Video Equipment MN88831
Application Circuit Example
MN88831’s built-in
final differential addition filter
Switched capacitor block output
OUTL–
OUTL+
Reference voltage
Bias voltage for operational amplifier
Structure of Analog Post Filter and Sample Analog Connections
BIAS
OUT
approx.
100Ω
OUTL
680Ω
4700pF 18kΩ
33µF
MI
PI
BIAS
+
22µF
V
REF
+
22µF
Page 6
MN88831 For Video Equipment
Package Dimensions (Unit: mm)
QFP048-P-1212A
14.2±0.4
12.0±0.3
36 25
37
48
(1.6)
24
(1.6)
±0.3
12.0
14.2±0.4
13
1
0.8
0.3
12
±0.1
2.0±0.2
2.4Max.
+0.10
0.05
-
(1.1)
0.15
0 to 10°
(0.55)
0.1
±0.1
0.1
SEATING PLANE
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