ADC08200
8-Bit, 20 MSPS to 200 MSPS, 1.05 mW/MSPS A/D
Converter
General Description
The ADC08200 is a low-power, 8-bit, monolithic analog-to-
digital converter with an on-chip track-and-hold circuit. Opti-
mized for low cost, low power, small size and ease of use,
this product operates at conversion rates up to 230 MSPS
while consuming just 1.05 mW per MHz of clock frequency,
or 210 mW at 200 MSPS. Raising the PD pin puts the
ADC08200 into a Power Down mode where it consumes
1 mW.
The unique architecture achieves 7.3 Effective Bits with
50 MHz input frequency. The ADC08200 is resistant to
latch-up and the outputs are short-circuit proof. The top and
bottom of the ADC08200's reference ladder are available for
connections, enabling a wide range of input possibilities. The
digital outputs are TTL/CMOS compatible with a separate
output power supply pin to support interfacing with 3V or
2.5V logic. The digital inputs (CLK and PD) are TTL/CMOS
compatible.
The ADC08200 is offered in a 24-lead plastic package
(TSSOP) and is specified over the industrial temperature
range of -40C to +85C.
Features
n
Single-ended input
n
Internal sample-and-hold function
n
Low voltage (single +3V) operation
n
Small package
n
Power-down feature
Key Specifications
j
Resolution:
8 bits
j
Maximum sampling frequency:
200 MSPS (min)
j
DNL:
0.4 LSB (typ)
j
ENOB (f
IN
= 50 MHz):
7.3 bits (typ)
j
THD (f
IN
= 50 MHz):
-61 dB (typ)
j
No missing codes
Guaranteed
j
Power Consumption
Operating
1.05 mW/MSPS (typ)
Power down
1 mW (typ)
Applications
n
Flat panel displays
n
Projection systems
n
Set-top boxes
n
Battery-powered instruments
n
Communications
n
Medical scan converters
n
X-ray imaging
n
High speed viterbi decoders
n
Astronomy
Pin Configuration
20017901
November 2002
ADC08200
8-Bit,
20
MSPS
to
200
MSPS,
1.05
mW/MSPS
A/D
Converter
2002 National Semiconductor Corporation
DS200179
www.national.com
Ordering Information
ADC08200CIMT
TSSOP
ADC08200CIMTX
TSSOP (tape and reel)
Block Diagram
20017902
Pin Descriptions and Equivalent Circuits
Pin No.
Symbol
Equivalent Circuit
Description
6
V
IN
Analog signal input. Conversion range is V
RB
to V
RT
.
3
V
RT
Analog Input that is the high (top) side of the reference
ladder of the ADC. Nominal range is 0.5V to V
A
. Voltage
on V
RT
and V
RB
inputs define the V
IN
conversion range.
Bypass well. See Section 2.0 for more information.
9
V
RM
Mid-point of the reference ladder. This pin should be
bypassed to a quiet point in the analog ground plane with
a 0.1 F capacitor.
10
V
RB
Analog Input that is the low side (bottom) of the
reference ladder of the ADC. Nominal range is 0.0V to
(V
RT
0.5V). Voltage on V
RT
and V
RB
inputs define the
V
IN
conversion range. Bypass well. See Section 2.0 for
more information.
ADC08200
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2
Pin Descriptions and Equivalent Circuits
(Continued)
Pin No.
Symbol
Equivalent Circuit
Description
23
PD
Power Down input. When this pin is high, the converter is
in the Power Down mode and the data output pins hold
the last conversion result.
24
CLK
CMOS/TTL compatible digital clock Input. V
IN
is sampled
on the rising edge of CLK input.
13 thru 16
and
19 thru 22
D0D7
Conversion data digital Output pins. D0 is the LSB, D7 is
the MSB. Valid data is output just after the rising edge of
the CLK input.
7
V
IN
GND
Reference ground for the single-ended analog input, V
IN
.
1, 4, 12
V
A
Positive analog supply pin. Connect to a quiet voltage
source of +3V. V
A
should be bypassed with a 0.1 F
ceramic chip capacitor for each pin, plus one
10 F capacitor. See Section 3.0 for more information.
18
V
DR
Power supply for the output drivers. If connected to V
A
,
decouple well from V
A
.
17
DR GND
The ground return for the output driver supply.
2, 5, 8, 11
AGND
The ground return for the analog supply.
ADC08200
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3
Absolute Maximum Ratings
(Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
A
)
3.8V
Driver Supply Voltage (V
DR
)
V
A
+0.3V
Voltage on Any Input or Output Pin
-0.3V to V
A
Reference Voltage (V
RT
, V
RB
)
V
A
to AGND
CLK, PD Voltage Range
-0.05V to
(V
A
+ 0.05V)
Input Current at Any Pin (Note 3)
25 mA
Package Input Current (Note 3)
50 mA
Power Dissipation at T
A
= 25C
See (Note 4)
ESD Susceptibility (Note 5)
Human Body Model
Machine Model
2500V
200V
Soldering Temperature, Infrared,
10 seconds (Note 6)
235C
Storage Temperature
-65C to +150C
Operating Ratings
(Notes 1, 2)
Operating Temperature Range
-40C
T
A
+85C
Supply Voltage (V
A
)
+2.7V to +3.6V
Driver Supply Voltage (V
DR
)
+2.4V to V
A
Ground Difference |GND - DR GND|
0V to 300 mV
Upper Reference Voltage (V
RT
)
0.5V to (V
A
-0.3V)
Lower Reference Voltage (V
RB
)
0V to (V
RT
-0.5V)
V
IN
Voltage Range
V
RB
to V
RT
Converter Electrical Characteristics
The following specifications apply for V
A
= V
DR
= +3.0V
DC
, V
RT
= +1.9V, V
RB
= 0.3V, C
L
= 5 pF, f
CLK
= 200 MHz at 50% duty
cycle. Boldface limits apply for T
A
= T
MIN
to T
MAX
: all other limits T
A
= 25C (Notes 7, 8)
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 9)
Units
(Limits)
DC ACCURACY
INL
Integral Non-Linearity
+1.0
-0.3
+1.9
-1.2
LSB (max)
LSB (min)
DNL
Differential Non-Linearity
0.4
0.95
LSB (max)
Missing Codes
0
(max)
FSE
Full Scale Error
36
50
mV (max)
V
OFF
Zero Scale Offset Error
46
60
mV (max)
ANALOG INPUT AND REFERENCE CHARACTERISTICS
V
IN
Input Voltage
1.6
V
RB
V (min)
V
RT
V (max)
C
IN
V
IN
Input Capacitance
V
IN
= 0.75V +0.5
Vrms
(CLK LOW)
3
pF
(CLK HIGH)
4
pF
R
IN
R
IN
Input Resistance
>
1
M
BW
Full Power Bandwidth
500
MHz
V
RT
Top Reference Voltage
1.9
V
A
V (max)
0.5
V (min)
V
RB
Bottom Reference Voltage
0.3
V
RT
- 0.5
V (max)
0
V (min)
R
REF
Reference Ladder Resistance
V
RT
to V
RB
160
120
(min)
200
(max)
CLK, PD DIGITAL INPUT CHARACTERISTICS
V
IH
Logical High Input Voltage
V
DR
= V
A
= 3.6V
2.0
V (min)
V
IL
Logical Low Input Voltage
V
DR
= V
A
= 2.7V
0.8
V (max)
I
IH
Logical High Input Current
V
IH
= V
DR
= V
A
= 3.6V
10
nA
I
IL
Logical Low Input Current
V
IL
= 0V, V
DR
= V
A
= 2.7V
-50
nA
C
IN
Logic Input Capacitance
3
pF
DIGITAL OUTPUT CHARACTERISTICS
V
OH
High Level Output Voltage
V
A
= V
DR
= 2.7V, I
OH
= -400 A
2.6
2.4
V (min)
V
OL
Low Level Output Voltage
V
A
= V
DR
= 2.7V, I
OL
= 1.0 mA
0.4
0.5
V (max)
ADC08200
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4
Converter Electrical Characteristics
(Continued)
The following specifications apply for V
A
= V
DR
= +3.0V
DC
, V
RT
= +1.9V, V
RB
= 0.3V, C
L
= 5 pF, f
CLK
= 200 MHz at 50% duty
cycle. Boldface limits apply for T
A
= T
MIN
to T
MAX
: all other limits T
A
= 25C (Notes 7, 8)
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 9)
Units
(Limits)
DYNAMIC PERFORMANCE
ENOB
Effective Number of Bits
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
7.5
Bits
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
7.4
Bits
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
7.3
6.9
Bits (min)
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
7.2
Bits
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
7.0
Bits
SINAD
Signal-to-Noise & Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
47
dB
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
46
dB
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
46
43.3
dB (min)
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
45
dB
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
44
dB
SNR
Signal-to-Noise Ratio
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
47
dB
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
46
dB
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
46
43.4
dB (min)
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
45
dB
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
44
dB
SFDR
Spurious Free Dynamic Range
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
60
dBc
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
58
dBc
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
60
dBc
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
57
dBc
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
54
dBc
THD
Total Harmonic Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
-60
dBc
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
-58
dBc
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
-60
dBc
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
-56
dBc
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
-53
dBc
HD2
2nd Harmonic Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
-66
dBc
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
-68
dBc
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
-66
dBc
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
-60
dBc
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
-55
dBc
HD3
3rd Harmonic Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
-72
dBc
f
IN
= 20 MHz, V
IN
= FS - 0.25 dB
-58
dBc
f
IN
= 50 MHz, V
IN
= FS - 0.25 dB
-72
dBc
f
IN
= 70 MHz, V
IN
= FS - 0.25 dB
-58
dBc
f
IN
= 100 MHz, V
IN
= FS - 0.25 dB
-60
dBc
IMD
Intermodulation Distortion
f
1
= 11 MHz, V
IN
= FS - 6.25 dB
f
2
= 12 MHz, V
IN
= FS - 6.25 dB
-55
dBc
POWER SUPPLY CHARACTERISTICS
I
A
Analog Supply Current
DC Input
69.75
86
mA (max)
f
IN
= 10 MHz, V
IN
= FS - 3 dB
69.75
mA (max)
I
DR
Output Driver Supply Current
DC Input, PD = Low
0.25
0.6
mA (max)
I
A
+ I
DR
Total Operating Current
DC Input, PD = Low
70
86.6
mA (max)
CLK Low, PD = Hi
0.3
mA
PC
Power Consumption
DC Input, Excluding Reference
210
260
mW (max)
PSRR
1
Power Supply Rejection Ratio
FSE change with 2.7V to 3.3V change
in V
A
54
dB
ADC08200
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