Fairchild Semiconductor SPT7734 Datasheet
SPT7734
8-BIT, 40 MSPS,175 mW A/D CONVERTER
FEATURES
• Monolithic 40 MSPS Converter
• 175 mW Power Dissipation
• On-Chip Track-and-Hold
• Single +5 V Power Supply
• TTL/CMOS Outputs
• 5 pF Input Capacitance
• Low Cost
• Tri-State Output Buffers
• High ESD Protection: 3,500 V Minimum
• Selectable +3 V or +5 V Logic I/O
GENERAL DESCRIPTION
The SPT7734 is a 8-bit monolithic, low cost, ultralow power
analog-to-digital converter capable of minimum word rates
of 40 MSPS. The on-chip track-and-hold function assures
very good dynamic performance without the need for external components. The input drive requirements are minimized due to the SPT7734's low input capacitance of only
5 pF.
Power dissipation is extremely low at only 175 mW typical at
40 MSPS with a power supply of +5.0 V. The digital outputs
APPLICATIONS
• All High-Speed Applications Where
Low Power Dissipation is Required
• Video Imaging
• Medical Imaging
• Radar Receivers
• IR Imaging
• Digital Communications
are +3 V or +5 V, and are user selectable. The SPT7734 has
incorporated proprietary circuit design and CMOS processing technologies to achieve its advanced performance. Inputs and outputs are TTL/CMOS compatible to interface with
TTL/CMOS logic systems. Output data format is straight
binary.
The SPT7734 is available in 28-lead SOIC and 32-lead small
(7 mm square) TQFP packages over the commercial temperature range.
BLOCK DIAGRAM
and
1:16
Mux
P1
P2
.
.
.
P15
P16
A
IN
CLK In
Enable
Data
Vali
d
Ref
In
Timing
Control
ADC Section 1
T/H
ADC Section 2
ADC Section 15
ADC Section 16
T/H
Auto-
Zero
CMP
.
.
.
Auto-
Zero
CMP
Reference Ladder
9-Bit
SAR
DAC
9-Bit
SAR
DAC
9
9
.
.
.
9
V
REF
9
.
.
.
9
9
9-Bit
16:1
Mux/
Error
Correction
D8 Overrange
D7 (MSB)
D6
D5
D4
D3
D2
D1
DØ (LSB)
ABSOLUTE MAXIMUM RATINGS (Beyond which damage may occur)1 25 °C
Supply Voltages
AVDD.........................................................................+6 V
Output
Digital Outputs .......................................................10 mA
DVDD........................................................................+6 V
Temperature
Input Voltages
Analog Input.................................. -0.5 V to AVDD +0.5 V
V
............................................................................
REF
0 to AV
CLK Input .................................................................. V
AV
DD
- DV
...............................................................
DD
±100 mV
DD
DD
Operating Temperature ................................. 0 to +70 °C
Junction Temperature ......................................... +175 °C
Lead Temperature, (soldering 10 seconds)........ +300 °C
Storage Temperature................................ -65 to +150 °C
AGND - DGND...................................................±100 mV
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
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Resolution 8 Bits
DC Accuracy
Analog Input
Reference Input
Reference Settling Time
Conversion Characteristics
Dynamic Performance
to T
MAX
Integral Nonlinearity IV ±1.0 LSB
Differential Nonlinearity IV ±0.5 LSB
No Missing Codes VI Guaranteed
Input Voltage Range VI V
Input Resistance IV 50 kΩ
Input Capacitance V 5.0 pF
Input Bandwidth (Small Signal) V 250 MHz
Offset V ±2.0 LSB
Gain Error V ±2.0 LSB
Resistance VI 300 500 600 Ω
Bandwidth V 100 150 MHz
Voltage Range
V
RLS
V
RHS
V
RHS
∆(V
RHF
∆(V
RLS
V
RHS
V
RLS
Maximum Conversion Rate VI 40 MHz
Minimum Conversion Rate IV 2 MHz
Pipeline Delay (Latency) IV 12
Aperture Delay Time V 4.0 ns
Aperture Jitter Time V 30 ps(p-p)
Effective Number of Bits
fIN=3.58 MHz VI 7.3 7.8 Bits
fIN=10.3 MHz VI 7.2 7.7 Bits
, AVDD=DVDD=+5.0 V, VIN=0 to 4 V, fS=40 MSPS, V
MAX
TEST TEST SPT7734
IV 0 - 2.0 V
IV 3.0 - AV
- V
RLS
- V
- V
)V90mV
RHS
)V75mV
RLF
V 1.0 4.0 5.0 V
V15Clock Cycles
V20Clock Cycles
RHS
=4.0 V, V
RLS
=0.0 V, unless otherwise specified.
RLS
V
RHS
DD
V
V
Clock Cycles
SPT7734
2 1/27/98
ELECTRICAL SPECIFICATIONS
TA=T
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Dynamic Performance
Spurious Free Dynamic Range f
Differential Phase V ±0.3 Degree
Differential Gain V ±0.3 %
Intermodulation Distortion TBD dB
Inputs
Digital Outputs
Power Supply Requirements
to T
MAX
Signal-to-Noise Ratio
(without Harmonics)
fIN=3.58 MHz VI 46 49 dB
fIN=10.3 MHz VI 45 48 dB
Harmonic Distortion 9 Distortion bins from
f
IN
fIN=10.3 MHz VI 53 56 dB
Signal-to-Noise and Distortion
(SINAD)
f
IN
fIN=10.3 MHz VI 45 48 dB
Logic 1 Voltage VI 2.0 V
Logic 0 Voltage VI 0.8 V
Maximum Input Current Low VI -10 +10 µA
Maximum Input Current High VI -10 +10 µA
Input Capacitance V +5 pF
Logic 1 Voltage I
Logic 0 Voltage IOL = 1.6 mA VI 0.4 V
t
RISE
t
FALL
Output Enable to Data Output Delay 20 pF load, TA = +25 °C V 10 ns
Voltages OV
Currents AI
Power Dissipation VI 175 225 mW
, AVDD=DVDD=+5.0 V, VIN=0 to 4 V, fS=40 MSPS, V
MAX
TEST TEST SPT7734
=3.58 MHz 1024 pt FFT VI 53 57 dB
=3.58 MHz VI 46 49 dB
=1.0 MHz V 63 dB
IN
= 0.5 mA VI 3.5 V
OH
15 pF load V 10 ns
15 pF load V 10 ns
50 pF load over temp. V 22 ns
IV 3.0 5.0 V
IV 4.75 5.0 5.25 V
IV 4.75 5.0 5.25 V
VI 17 22 mA
VI 18 23 mA
DV
AV
DI
DD
DD
DD
DD
DD
RHS
=4.0 V, V
=0.0 V, unless otherwise specified.
RLS
TEST LEVEL CODES
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.
TEST LEVEL
I
II
III
IV
V
VI
3 1/27/98
TEST PROCEDURE
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.
SPT7734
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