ELAN EM19100S, EM19100M Datasheet
8-BIT 20 MSPS VIDEO A/D CONVERTER (CMOS)
8-BIT 20 MSPS VIDEO A/D CONVERTER (CMOS)
GENERAL DESCRIPTION
EM19100 is an 8-bit CMOS A/D converter for video use. The adoption of a 2-step parallel system achieves low
consumption at a maximum conversion speed of 20 MSPS typical.
FEATURES
• 20MSPS maximum conversion speed
• Build-in sampling and hold circuit
• Internal self-bias reference voltage
• 90mW power dissipation at 20MSPS
• +5V single power supply
• Available in 24 pin SOP
• Series
EM19100M for 300 mil SOP
EM19100S for 209 mil SOP
EM19100
EM19100
APPLICATION
TV,VCR digital systems and a wide range of fields where high speed A/D conversion is required.
PIN ASSIGNMENT
EM19100
DVSS
DVDD
CLK
OE
1
2
D0
3
D1
4
D2
5
D3
6
D4
7
D5
8
D6
9
D7
10
11
12
DVSS
24
VRB
23
VRBS
22
AVSS
21
AVSS
20
VIN
19
AVDD
18
VRT
17
VRTS
16
AVDD
15
AVDD
14
DVDD
13
FUNCTIONAL BLOCK DIAGRAM
DVSS
1
/OE
DVSS
2
D0
3
D1
4
Lower data
D2
D3
D4
D5
D6
D7
DVDD
CLK DVDD
latches
5
6
7
8
Upper data
latches
9
10
11
Clock generator
12
Lower encoder
(4bit)
Lower encoder
(4bit)
Upper encoder
(4bit)
Comparators with
Comparators with
Comparators with
Reference voltage
Lower
S/ H (4bit)
Lower
S/ H (4bit)
Upper
S/ H (4bit)
24
VRB
23
VRBS
22
21
AVSS
20
AVSS
VIN
19
AVDD
18
17
VRT
VRTS
16
AVDD
15
14
AVDD
13
* This specification are subject to be changed without notice.
1.26.1996
1
OUTPUT CODING
Step Analog Input (V) Digital Output Code Conditions
0 0.607815 00000000 VRB=0.6V
1 0.607815~0.6156250 00000001 VRT=2.6V
2 0.6156250~0.6234375 00000010 1LSB=7.8125mV
.... .... ....
124 1.6000000~1.6078125 10000000
125 1.6078125~1.6156250 10000001
.... .... ....
254 2.5843750~2.5921875 11111110
255 2.5921875~ 11111111
Clock
EM19100
8-BIT 20 MSPS VIDEO A/D CONVERTER (CMOS)
Analog input
Data output
N
N-3
ABSOLUTE MAXIMUM RATINGS (T
=25°C)
A
N+1
N-2
N+2
N-1
N+3
N
N+4
N+1
Items Sym. Rating Unit
Supply voltage V
Operating temperature T
Input voltage V
Ref, Input voltage V
DD
OPR
IN
RT,VRB
7V
-20 to +65 °C
V
to V
SS
DD
V
to V
SS
DD
V
V
(FC=20MPS,VDD=5V,VRB=0.5V,VRT=2.5V,Ta=25 deg.)
Parameter Sym. Conditions Min. Typ. Max. Unit
Maximum Conversion Speed F
Supply current I
Reference pin current I
C
DD
REF
Vin=0.6V to 2.6V fin=1kHz ramp 20 MSPS
FC=20MSPS NTSC ramp wave input 12 17 mA
5.7 8.0 9.1 mA
Analog input bandwidth BW 10 MHz
Analog input capacitance C
Reference resistance R
Internal bias V
VRT-V
Offset Voltage E
E
Digital input voltage V
Digital input current I
IN
REF
RB
OT
OB
IH
V
IL
IH
I
IL
VIN=1.5V+0.07Vrms 11 pF
220 250 350 Ω
Short VRB and V
Short VRT and V
RB
RBS
RTS
0.55 0.6 0.65 V
1.9 2.0 2.1
-10 -35 -60 mV
01545
4.0 V
VDD=max. VIH=V
DD
VIL=0V 5
1.0
5uA
* This specification are subject to be changed without notice.
1.26.1996
2
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