ADC08100
8-Bit, 20 MSPS to 100 MSPS, 1.3 mW/MSPS A/D
Converter
General Description
The ADC08100 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 of 20 MSPS to
100 MSPS with outstanding dynamic performance over its
full operating range while consuming just 1.3 mW per MHz of
clock frequency. That's just 130 mW of power at 100 MSPS.
Raising the PD pin puts the ADC08100 into a Power Down
mode where it consumes just 1 mW.
The unique architecture achieves 7.4 Effective Bits with
41 MHz input frequency. The excellent DC and AC charac-
teristics of this device, together with its low power consump-
tion and single +3V supply operation, make it ideally suited
for many imaging and communications applications, includ-
ing use in portable equipment. Furthermore, the ADC08100
is resistant to latch-up and the outputs are short-circuit proof.
The top and bottom of the ADC08100'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 interfac-
ing with 3V or 2.5V logic. The digital inputs (CLK and PD) are
TTL/CMOS compatible.
The ADC08100 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
n
Resolution
8 bits
n
Maximum sampling frequency
100 MSPS (min)
n
DNL
0.4 LSB (typ)
n
ENOB
7.4 bits (typ) at f
IN
= 41 MHz
n
THD
-60 dB (typ)
n
Guaranteed no missing codes
n
Power consumption
-- Operating:
1.3 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
10137101
December 2002
ADC08100
8-Bit,
100
MSPS,
1.3
mW/MSPS
A/D
Converter
2002 National Semiconductor Corporation
DS101371
www.national.com
Ordering Information
ADC08100CIMT
TSSOP
ADC08100CIMTX
TSSOP (tape and reel)
Block Diagram
10137102
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 1.0V 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 clean, 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
1.0V). Voltage on V
RT
and V
RB
inputs define the
V
IN
conversion range. Bypass well. See Section 2.0 for
more information.
ADC08100
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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 falling 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 clean, 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
DR V
D
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.
ADC08100
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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 (DR V
D
)
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, OE Voltage Range
-0.3V to
(V
A
+ 0.3V)
Digital Output Voltage (V
OH
, V
OL
)
DR GND to DR V
D
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
250V
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 (DR V
D
)
+2.4V to V
A
Ground Difference |GND - DR GND|
0V to 300 mV
Upper Reference Voltage (V
RT
)
1.0V to (V
A
+ 0.1V)
Lower Reference Voltage (V
RB
)
0V to (V
RT
- 1.0V)
V
IN
Voltage Range
V
RB
to V
RT
Converter Electrical Characteristics
The following specifications apply for V
A
= DR V
D
= +3.0V
DC
, V
RT
= +1.9V, V
RB
= 0.3V, C
L
= 10 pF, f
CLK
= 100 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
0.5
1.3
LSB (max)
DNL
Differential Non-Linearity
0.4
+1.0
-0.95
LSB (max)
LSB (min)
Missing Codes
0
(max)
FSE
Full Scale Error
18
28
mV (max)
V
OFF
Zero Scale Offset Error
26
35
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
200
MHz
V
RT
Top Reference Voltage
1.9
V
A
V (max)
1.0
V (min)
V
RB
Bottom Reference Voltage
0.3
V
RT
- 1.0
V (max)
0
V (min)
V
RT
-
V
RB
Reference Delta
1.6
1.0
V (min)
2.3
V(max)
R
REF
Reference Ladder Resistance
V
RT
to V
RB
220
150
(min)
300
(max)
I
REF
Reference Ladder Current
7.3
5.3
mA (min)
10.6
mA (max)
CLK, PD DIGITAL INPUT CHARACTERISTICS
V
IH
Logical High Input Voltage
DR V
D
= V
A
= 3.3V
2.0
V (min)
V
IL
Logical Low Input Voltage
DR V
D
= V
A
= 2.7V
0.8
V (max)
I
IH
Logical High Input Current
V
IH
= DR V
D
= V
A
= 3.3V
10
nA
ADC08100
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4
Converter Electrical Characteristics
(Continued)
The following specifications apply for V
A
= DR V
D
= +3.0V
DC
, V
RT
= +1.9V, V
RB
= 0.3V, C
L
= 10 pF, f
CLK
= 100 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)
CLK, PD DIGITAL INPUT CHARACTERISTICS
I
IL
Logical Low Input Current
V
IL
= 0V, DR V
D
= V
A
= 2.7V
-50
nA
C
IN
Logic Input Capacitance
3
pF
DIGITAL OUTPUT CHARACTERISTICS
V
OH
High Level Output Voltage
V
A
= DR V
D
= 2.7V, I
OH
= -400 A
2.6
2.4
V (min)
V
OL
Low Level Output Voltage
V
A
= DR V
D
= 2.7V, I
OL
= 1.0 mA
0.4
0.5
V (max)
DYNAMIC PERFORMANCE
ENOB
Effective Number of Bits
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
7.5
Bits
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
7.5
7.0
Bits (min)
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB,
T
A
= 25C
7.3
6.9
Bits (min)
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB, T
A
= T
MIN
to T
MAX
7.3
6.8
Bits (min)
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
7.2
Bits
SINAD
Signal-to-Noise & Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
47
dB
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
47
43.9
dB (min)
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB,
T
A
= 25C
46
43.3
dB (min)
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB, T
A
= T
MIN
to T
MAX
46
42.7
dB (min)
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
45
dB
SNR
Signal-to-Noise Ratio
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
47
dB
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
47
44
dB (min)
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB
46.5
42.8
dB (min)
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
45.8
dB
SFDR
Spurious Free Dynamic Range
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
61
dBc
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
60
dBc
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB
63
dBc
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
54
dBc
THD
Total Harmonic Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
-61
dBc
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
-60
dBc
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB
-60
dBc
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
-54
dBc
HD2
2nd Harmonic Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
-62
dBc
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
-60
dBc
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB
-63
dBc
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
-54
dBc
HD3
3rd Harmonic Distortion
f
IN
= 4 MHz, V
IN
= FS - 0.25 dB
-68
dBc
f
IN
= 10 MHz, V
IN
= FS - 0.25 dB
-65
dBc
f
IN
= 41 MHz, V
IN
= FS - 0.25 dB
-64
dBc
f
IN
= 49.8 MHz, V
IN
= FS - 0.25 dB
-68
dBc
IMD
Intermodulation Distortion
f
1
= 9 MHz, V
IN
= FS - 6.25 dB
f
2
= 10 MHz, V
IN
= FS - 6.25 dB
-48
dBc
POWER SUPPLY CHARACTERISTICS
I
A
Analog Supply Current
DC Input
41
50
mA (max)
f
IN
= 10 MHz, V
IN
= FS - 3 dB
41
mA (max)
ADC08100
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