Fairchild Semiconductor SPT7730 Datasheet
SPT7730
A
A
8-BIT, 3.0 MSPS, SERIAL OUTPUT A/D CONVERTER
FEATURES
• 8-Bit, 1 kHz to 3.0 MSPS Analog-to-Digital Converter
• Monolithic CMOS
• Serial Output
• Internal Sample-and-Hold
• Analog Input Range: 0 to 2 V Nominal; 3.3 V Max
• Power Dissipation (Excluding Reference Ladder)
45 mW at +5 V
16 mW at +3 V
• Single Power Supply: +3 V to +5 V Range
• High ESD Protection: 3,000 V Minimum
GENERAL DESCRIPTION
The Fairchild 8-bit, 3.0 MSPS, serial analog-to-digital converter delivers excellent high speed conversion performance
with low cost and low power. The serial port protocol is
compatible with the serial peripheral interface (SPI) or
MICROWIRE™ industry standard, high-speed synchronous
MPU interfaces. The large input bandwidth and fast transient
response time allow for CCD applications operating up to
3.0 MSPS.
APPLICATIONS
• Handheld and Desktop Scanners
• DSP Interface Applications
• Portable Digital Radios
• Portable and Handheld Applications
• Automotive Applications
• Remote Sensing
The device can operate with a power supply range from +3 V
to +5 V with very low power dissipation. The small package
size makes this part excellent for handheld applications
where board space is a premium. The SPT7730 is available
in an 8-lead SOIC package over the commercial temperature range. Contact the factory for availability of die and
industrial temperature range versions.
BLOCK DIAGRAM
Analog Input
Start Convert
Clock
Ground
Track-and-Hold
SAR
8-Bit
A/D
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Timing And Control
Serial
Output
Logic
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V
REF+
V
REF-
V
DD
Data Out
ABSOLUTE MAXIMUM RATING (Beyond which damage may occur)
1
Supply Voltages
VDD...........................................................................+6 V
Input Voltages
Analog Input ................................................. -0.7 to +6 V
V
+ ........................................................... -0.7 to +6 V
REF
V
- ............................................................ -0.7 to +6 V
REF
Clock and SC............................................... -0.7 to +6 V
Output
Data Out ................................................................10 mA
Temperature
Operating, ambient ..................................... 0 to 70 °C
junction........................................ + 175 °C
Lead, Soldering (10 seconds) ...........................+ 300 °C
Storage ................................................... -65 to + 150 °C
Note: 1. Operation at any Absolute Maximum Ratings is not implied. See Electrical Specifications for proper nominal applied
conditions in typical applications.
ELECTRICAL SPECIFICATIONS
TA = +25 °C, VDD = +5.0 V, VIN = 0 to +3 V, f
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
DC ELECTRICAL CHARACTERISTICS
DC Performance
Resolution 8 Bits
Differential Linearity I ±0.2 ±0.5 LSB
Integral Linearity I ±0.2 ±0.5 LSB
No Missing Codes I Guaranteed
Analog Input
Input Voltage Range
Input Resistance I 5 MΩ
Input Capacitance IV 5 pF
Input Bandwidth (Small Signal) IV 30 MHz
Offset IV -2 +2 % of FSR
Gain Error IV -2 +2 % of FSR
Reference Input
Resistance IV 250 280 350 Ω
Voltage Range
2
V
REF-
2
V
REF+
V
REF+ -VREF-
Reference Settling Time IV 90 ns
Timing Characteristics
Maximum Conversion Rate I 3.0 1.0 MSPS
Minimum Conversion Rate IV 1 kSPS
Maximum External Clock Rate I 36 12 MHz
Minimum External Clock Rate IV 12 kHz
Aperture Delay Time IV 5 ns
Aperture Jitter Time IV 5 ps
Data Ouput LSB Hold Time T
1
Percentages refer to percent of [(V
2
∆ = Minimum (V
1
1
(∆) IV 1/10 V
REF+
REF+ -VREF-
)
= 36 MHz, fS = 3.0 MSPS, V
CLK
REF
TEST TEST
to T
MIN
) -(V
REF-
MAX
)]
+ = +3.0 V, V
IV V
REF-
IV -4% 0 V
IV V
- = 0.0 V, unless otherwise specified.
REF
+4% V
+∆ 2/3 V
REF-
DD
REF+
REF+
-6% V
-∆ V
DD
V
V
IV 6 8 ns
SPT7730
2 12/19/97
ELECTRICAL SPECIFICATIONS
TA = +25 °C, VDD = +5.0 V, VIN = 0 to +3 V, f
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Dynamic Performance
Effective Number of Bits
f
= 500 kHz IV 7.5 Bits
IN
Signal-to-Noise Ratio
fIN = 500 kHz IV 47 dB
Harmonic Distortion
fIN = 500 kHz IV 60 dB
Power Supply Requirements
+V
Supply Voltage IV 3 5.5 V
DD
+V
Supply Current VDD = 3.0 V IV 5.4 7 mA
DD
Power Dissipation V
3
Excluding the reference ladder.
3
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.
= 36 MHz, fS = 3.0 MSPS, V
CLK
TEST TEST
= 5.0 V I 9 10 mA
V
DD
= 3.0 V IV 16 22 mW
DD
VDD = 5.0 V I 45 50 mW
TEST LEVEL
I
II
+ = +3.0 V, V
REF
- = 0.0 V, unless otherwise specified.
REF
TEST PROCEDURE
100% production tested at the specified temperature.
100% production tested at TA=25 °C, and sample
tested at the specified temperatures.
III
IV
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design
and characterization data.
V
Parameter is a typical value for information purposes
only.
VI
100% production tested at TA = 25 °C. Parameter is
guaranteed over specified temperature range.
SPT7730
3 12/19/97
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