Ordering number : EN
*5428A
CMOS LSI
LC89086M
8 Bit A/D Converter
Preliminary
Overview
The LC89086M is a low-power high-speed 8-bit serial-
parallel A/D converter fabricated in a high-speed CMOS
process.
Package Dimensions
unit: mm
3155-MFP24
[LC89086M]
Features
•
•
•
•
•
•
•
Resolution: 8 bits (with an overflow output)
Maximum conversion rate: 20M samples per second
Error: Less than ±1.0 LSB
Power supply: +5-V single-voltage power supply
Power dissipation: 150 mW (typical)
Analog input voltage range: V
SS
to V
DD
Digital output voltage: 3 state TTL level
SANYO: MFP24
Specifications
Absolute Maximum Ratings
at Ta = 25°C, DV
SS
= AV
SS
= 0 V
Parameter
Maximum supply voltage
Input voltage
Operating temperature
Storage temperature
Symbol
V
DD
max
V
IN
max
Topr
Tstg
Conditions
Ratings
–0.3 to +7.0
–0.3 to V
DD
+0.3
–30 to +70
–40 to +125
Unit
V
V
°C
°C
Recommended Operating Conditions
Parameter
Supply voltage
Operating ambient temperature
Symbol
V
DD
Ta
Conditions
Ratings
min
4.5
–30
typ
5.0
max
5.5
+70
Unit
V
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O3097HA (OT) No. 5428-1/6
LC89086M
Electrical Characteristics
Electrical DC Characteristics
at Ta = –30 to +70°C,
AV
DD
= DV
DD
= 4.5 to 5.5 V, AV
SS
= DV
SS
= 0 V
Parameter
Reference resistance
Analog input capacitance
Analog input resistance
Reference high-level input voltage
Reference low-level input voltage
Reference high-level output voltage
Symbol
Rref
C
AIN
R
AIN
VrefH
VrefL
VrefH
When VrefHO (pin 4) and VrefLO (pin 9)
are unused.
Vref L + 2.0
0
1.9
2.0
Conditions
VrefH (pin 5) – VrefL (pin 8)
Ratings
min
210
typ
300
30
10
V
DD
VrefH – 2.0
2.1
max
390
Unit
Ω
pF
MΩ
V
V
V
When VrefHO (pin 4) and VrefLO (pin 9) are unused.
When VrefHO (pin 4) and VrefLO (pin 9)
are used, and AV
DD
= DV
DD
= 5 V
When VrefHO (pin 4) and VrefLO (pin 9)
are used, and AV
DD
= DV
DD
= 5 V
Reference low-level output voltage
Analog input voltage
Digital high-level voltage
Digital low-level voltage
Digital high-level output current
Digital low-level output current
VrefL
V
AIN
V
IH
V
IL
I
OH
I
OL
–0.05
VrefL
2.2
–0.3
0
+0.05
VrefH
V
DD
+0.3
+0.8
V
V
V
V
mA
mA
V
OH
= V
DD
– 0.4 V
V
OL
= 0.4 V
–2
2
Electrical AC Characteristics 1
at Ta = –30 to +70°C, AV
DD
= DV
DD
= 4.5 to 5.5 V, AV
SS
= DV
SS
= 0 V
Parameter
Clock high-level period
Clock low-level period
Analog input acquisition time
Digital output data delay time
Digital output data enable time
Digital output data disable time
Symbol
T
WH
T
WL
T
AP
Td
T
OE
T
OD
C load = 30 pF
C load = 30 pF
C load = 30 pF
Conditions
Ratings
min
23
23
10
15
2
2
20
30
5
5
30
45
10
10
typ
max
Unit
ns
ns
ns
ns
ns
ns
No. 5428-2/6
LC89086M
Timing Chart
Clock input
(CLK)
TWH
Analog input
(AIN)
TWL
TAP
1.5 V
N+3
N
N+1
Td
N+2
Digital output
(D8 to D1,OF)
N–4
N–3
N –2
N–1
1.5 V
N
Output enable input
(OEB)
TOE
1.5V
TOD
Digital output
(D8 to D1,OF)
High impedance
A09018
The analog signal (AIN) is acquired on the falling edge of the clock input (CLK). The acquired analog signal is
converted to a digital code and is output from the digital outputs (D8 to D1, OF) on the clock falling edge delayed three
clock cycles from the clock cycle in which the analog signal was acquired.
Electrical AC Characteristics 2
at Ta = 25°C, AV
DD
= DV
DD
= 5 V, AV
SS
= DV
SS
= 0 V, VrefH = 2 V, VrefL = 0 V
Parameter
Resolution
Maximum conversion rate
Linearity error
Differential linearity error
Offset voltage
Power dissipation
Symbol
Res
Fs
LE
DLE
V
offset
Pd
DC accuracy
DC accuracy
DC accuracy
Fs = 20 MSPS
10
50
150
Conditions
Ratings
min
typ
max
8
20
±1.0
±1.0
90
220
Unit
bit
MSPS
LSB
LSB
mV
mW
Note: Test circuits must conform to the sample application circuit.
No. 5428-3/6
LC89086M
Block Diagram
OEB
1
Upper encoder
Lower Vref selection
22
OF
AIN
6
Upper comparator
Data correction
VrefH
5
Lower comparator
VrefM
7
Resistor string
Lower encoder
Output register
21
D1(MSB)
14
D8(LSB)
VrefL
8
Reference voltage
generation
Clock generation
23
CLK
4
VrefHO
9
VrefLO
A09019
Pin Assignment
Top view
No. 5428-4/6
LC89086M
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pin name
OEB
DV
SS
AV
SS
Vref HO
Vref H
AIN
Vref M
Vref L
Vref LO
AV
DD
AV
SS
DV
SS
DV
DD
D8
D7
D6
D5
D4
D3
D2
D1
OF
CLK
DV
DD
O
O
O
O
O
O
O
O
O
I
O
I
I
O
I
O
I/O
I
Digital output enable input
High: high-impedance
Low: Normal operation
Digital ground
Analog ground
Internal reference voltage (high) generation. Shorting this pin to VrefH (pin 5) generates a voltage of 2.0 V.
This pin must be left open when the internally generated potential is not used.
Reference voltage input (high)
Analog input
Reference voltage intermediate level tap.
Reference voltage input (low)
Internal reference voltage (low) generation. Shorting this pin to VrefL (pin 8) generates a voltage of 0 V.
This pin must be left open when the internally generated potential is not used.
Analog power supply
Analog ground
Digital ground
Digital power supply
Digital output (LSB)
Digital output
Digital output
Digital output
Digital output
Digital output
Digital output
Digital output (MSB)
Digital output (Overflow)
Clock input
Digital power supply
Function
Note: There must be no potential difference between the digital system and analog system V
DD
and V
SS
power supply potentials.
I/O Code Table
The table below lists the relationship between the input and output when VrefH and VrefL are set up so that the zero
transient voltage is 0.000 V and the full-scale transient voltage is 2.008V.
Analog input
V
AIN
(V)
Up to 0.000
Up to 0.008
Up to 0.016
Up to 0.024
Up to 0.032
OF
0
0
0
0
0
D1
0
0
0
0
0
D2
0
0
0
0
0
D3
0
0
0
0
0
Digital output
D4
0
0
0
0
0
D5
0
0
0
0
0
D6
0
0
0
0
0
D7
0
0
0
1
1
D8
0
0
1
0
1
to
Up to 0.992
Up to 1.000
Up to 1.008
Up to 1.016
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
to
Up to 1.992
Up to 2.000
Up to 2.008
Over 2.008
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
1
1
1
0
1
1
No. 5428-5/6
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