SPT SPT7920SCJ, SPT7920SCQ Datasheet
SPT7920
12-BIT, 10 MSPS, TTL, A/D CONVERTER
FEATURES
• Monolithic
• 12-Bit 10 MSPS Converter
• 66 dB SNR @ 1 MHz Input
• On-Chip Track/Hold
• Bipolar ±2.0 V Analog Input
• Low Power (1.1 W Typical)
• 5 pF Input Capacitance
• TTL Outputs
GENERAL DESCRIPTION
The SPT7920 A/D converter is the industry's first 12-bit
monolithic analog-to-digital converter capable of sample
rates greater than 10 MSPS. On board input buffer and
track/hold function assures excellent dynamic performance without the need for external components. Drive
requirement problems are minimized with an input capacitance of only 5 pF.
Logic inputs and outputs are TTL. An overrange output
signal is provided to indicate overflow conditions. Output
APPLICATIONS
• Radar Receivers
• Professional Video
• Instrumentation
• Medical Imaging
• Electronic Warfare
• Digital Communications
• Digital Spectrum Analyzers
• Electro-Optics
data format is straight binary. Power dissipation is very low
at only 1.1 watts with power supply voltages of +5.0 and
-5.2 volts. The SPT7920 also provides a wide input voltage
range of ±2.0 volts.
The SPT7920 is available in 32-lead ceramic sidebrazed
DIP and 44-lead cerquad packages over the commercial
temperature range. Consult the factory for availability of die,
military temperature and /883 versions.
BLOCK DIAGRAM
V
Input
IN
Buffer
Analog Gain
Compression
Processor
Signal Processing Technologies, Inc.
4-Bit Flash
Converter
Track-and-Hold
Amplifiers
Asynchronous
SAR
4
Correction,
Output TTL
8
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370
Error
Decoding
and
Drivers
Digital
Output
12
ABSOLUTE MAXIMUM RATINGS (Beyond which damage may occur)1 25 °C
Supply Voltages
VCC...........................................................................+6 V
Output
Digital Outputs .............................................. 0 to -30 mA
VEE........................................................................... -6 V
Temperature
Input Voltages
Analog Input............................................... VFB≤VIN≤V
VFT, VFB. ................................................... +3.0 V, -3.0 V
Reference Ladder Current .....................................12 mA
CLK IN ...................................................................... V
FT
CC
Operating Temperature ................................. 0 to +70 °C
Junction Temperature .........................................+175 °C
Lead Temperature, (soldering 10 seconds)........ +300 °C
Storage Temperature................................ -65 to +150 °C
Note: 1. Operation at any Absolute Maximum Rating is not implied. See Electrical Specifications for proper nominal
applied conditions in typical applications.
ELECTRICAL SPECIFICATIONS
TA=T
unless otherwise specified.
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Resolution 12 Bits
DC Accuracy T
Analog Input
Reference Input f
Timing Characteristics
Dynamic Performance
to T
MIN
Integral Nonlinearity ± Full Scale V ±2.0 LSB
Differential Nonlinearity 100 kHz Sample Rate V ±0.8 LSB
No Missing Codes VI Guaranteed
Input Voltage Range f
Input Bias Current T
Input Resistance V
Input Capacitance V 5 pF
Input Bandwidth 3 dB Small Signal V 120 MHz
+FS Error V ±5.0 LSB
-FS Error V ±5.0 LSB
Reference Ladder Resistance VI 500 800 Ω
Reference Ladder Tempco V 0.8 Ω/°C
Maximum Conversion Rate VI 10 MHz
Overvoltage Recovery Time V 20 ns
Pipeline Delay (Latency) IV 1
Output Delay TA=+25 °C V 14 18 ns
Aperture Delay Time T
Aperture Jitter Time TA=+25 °C V 5 ps-RMS
Effective Number of Bits
f
=500 kHz 10.2 Bits
IN
f
=1.0 MHz 10.0 Bits
IN
f
=3.58 MHz 9.5 Bits
IN
Signal-to-Noise Ratio
(without Harmonics)
=500 kHz TA=+25 °C I 64 67 dB
f
IN
f
=1 MHz TA=+25 °C I 64 66 dB
IN
f
=3.58 MHz TA=+25 °C I 62 64 dB
IN
, VCC=+5.0 V, VEE=-5.2 V, DVCC=+5.0 V, VIN=±2.0 V, VSB=-2.0 V, VST=+2.0 V, f
MAX
TEST TEST SPT7920
=+25 °C
A
=1 MHz VI ±2.0 V
CLK
=+25 °C I 30 60 µA
A
=0 V, TA=+25 °C I 100 300 kΩ
IN
=1 MHz
CLK
=+25 °CV 1 ns
A
T
T
TA=T
A=TMIN
A=TMIN
MIN
to T
to T
to T
MAX
MAX
MAX
IV 58 61 dB
IV 58 60 dB
IV 58 60 dB
10 MHz, 50% clock duty cycle,
CLK=
Clock Cycle
SPT
SPT7920
2 3/10/97
ELECTRICAL SPECIFICATIONS
TA=T
MIN
to T
, VCC=+5.0 V, VEE=-5.2 V, DVCC=+5.0 V, VIN=±2.0 V, VSB=-2.0 V, VST=+2.0 V, f
MAX
10 MHz, 50% clock duty
CLK=
cycle, unless otherwise specified.
TEST TEST SPT7920
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Dynamic Performance
Harmonic Distortion
=500 kHz TA=+25 °C I 63 66 dB
f
IN
=1.0 MHz TA=+25 °C I 63 65 dB
f
IN
f
=3.58 MHz TA=+25 °C I 59 61 dB
IN
T
A=TMIN
T
A=TMIN
T
A=TMIN
to T
to T
to T
MAX
MAX
MAX
IV 59 62 dB
IV 59 61 dB
IV 57 59 dB
Signal-to-Noise and Distortion
=500 kHz TA=+25 °C I 60 63 dB
f
IN
f
=1.0 MHz TA=+25 °C I 60 62 dB
IN
f
=3.58 MHz TA=+25 °C I 57 59 dB
IN
Spurious Free Dynamic Range
Differential Phase
Differential Gain
2
2
Digital Inputs f
Logic 1 Voltage T
Logic 0 Voltage T
Maximum Input Current Low T
Maximum Input Current High T
T
T
T
1
TA=+25 °C V 74 dB
A=TMIN
A=TMIN
A=TMIN
to T
to T
to T
MAX
MAX
MAX
IV 55 58 dB
IV 55 57 dB
IV 54 56 dB
TA=+25 °C V 0.2 Degree
TA=+25 °C V 0.7 %
=1 MHz
CLK
=+25 °C I 2.4 4.5 V
A
=+25 °C I 0.8 V
A
=+25 °C I 0 +5 +20 µA
A
=+25 °C I 0 +5 +20 µA
A
Pulse Width Low (CLK) IV 30 ns
Pulse Width High (CLK) IV 30 300 ns
Digital Outputs f
Logic 1 Voltage T
=1 MHz
CLK
=+25 °C I 2.4 V
A
Logic 0 Voltage TA=+25 °C I 0.6 V
Power Supply Requirements
Voltages V
DV
-V
Currents I
DI
-I
CC
EE
CC
CC
EE
TA=+25 °C I 135 150 mA
CC
TA=+25 °C I 45 70 mA
IV 4.75 5.0 5.25 V
IV 4.75 5.0 5.25 V
IV -4.95 -5.2 -5.45 V
I4055mA
Power Dissipation VI 1.1 1.3 W
Power Supply Rejection +5 V ±0.25 V, -5.2 ±0.25 V V 1.0 LSB
Typical thermal impedances (unsoldered, in free air):
32L sidebrazed DIP:
θ
= +50 °C/W
ja
44L cerquad:
θ
= +78 °C/W
ja
at 1 M/s airflow = +58 °C/W
θ
ja
= +3.3 °C/W
θ
jc
1
fIN = 1 MHz.
2
fIN = 3.58 and 4.35 MHz.
SPT
SPT7920
3 3/10/97
TEST LEVEL CODES
TEST LEVEL
TEST PROCEDURE
All electrical characteristics are subject to the
following conditions:
All parameters having min/max specifications
are guaranteed. The Test Level column indicates the specific device testing actually performed during production and Quality Assurance inspection. Any blank section in the data
column indicates that the specification is not
tested at the specified condition.
Figure 1A: Timing Diagram
N
tt
pwH pwL
II
III
IV
V
VI
I
100% production tested at the specified temperature.
100% production tested at TA = +25 °C, and sample
tested at the specified temperatures.
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design
and characterization data.
Parameter is a typical value for information purposes
only.
100% production tested at TA = +25 °C. Parameter is
guaranteed over specified temperature range.
N+1
N+2
CLK
t
d
OUTPUT
DATA
N-2 N-1
DATA VALID
N
DATA VALID
N+1
Figure 1B: Single Event Clock
CLK
t
d
OUTPUT
DATA
DATA VALID
Table I - Timing Parameters
PARAMETERS DESCRIPTION MIN TYP MAX UNITS
t
d
t
pwH
CLK to Data Valid Prop Delay - 14 18 ns
CLK High Pulse Width 30 - 300 ns
t
pwL
SPT
CLK Low Pulse Width 30 - - ns
SPT7920
4 3/10/97
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