SPT SPT7862SIT Datasheet
SPT7862
10-BIT, 40 MSPS, DUAL-CHANNEL A/D CONVERTER
FEATURES
• Dual-channel, 10-Bit, 40 MSPS analog-to-digital
converter
• Low power dissipation: 320 mW (typical)
• Internal track-and-hold
• Single +5 volt supply
• Tri-state, TTL/CMOS-compatible outputs
• Selectable +3 or +5 V logic I/O
• High ESD protection of 3,500 volts minimum
GENERAL DESCRIPTION
The SPT7862 contains two separate 10-bit CMOS analogto-digital converters that have sampling rates of up to 40
MSPS. Each device has its own separate clock and reference inputs so that they can be used independently in
multichannel applications or can be driven from the same
inputs for demanding quadrature demodulation and S-video
applications. On-chip track-and-hold and advanced proprietary circuit design in a CMOS process technology provide
very good dynamic performance.
BLOCK DIAGRAM
AV
DD
AGND DV
APPLICATIONS
• Video set-top boxes
• Cellular base stations
• QPSK/QAM RF demodulation
• S-video digitizers
• Composite video digitizers
• Portable and handheld instrumentation
• Medical ultrasound
• Cable modems
• Video frame grabbers
The SPT7862 operates from a single +5 V supply. Digital
data outputs are user selectable at +3 or +5 V. Output data
format is straight binary.
The SPT7862 is available in a 64-lead TQFP package
(10 x 10 mm) over the industrial temperature range of
–40 °C to +85 °C.
DGND
DD
OV
(+3.3/5.0 V)
DDA
V
INA
V
INRA
V
RHFA
V
RHSA
V
RLFA
V
RLSA
CLK A
V
INB
V
INRB
V
RHFB
V
RHSB
V
RLFB
V
RLSB
CLK B
ADC
Reference
Ladder
Timing
Generation
ADC
Reference
Ladder
Timing
Generation
Output
Buffers
Output
Buffers
DA9–0
OGND
DAV
A
EN
OV
DDB
DB9–0
OGND
DAV
B
A
(+3.3/5.0 V)
B
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370 Website: http://www.spt.com E-Mail: sales@spt.com
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
................................................................. 0 to AV
REF
CLK Input ...................................................................V
AV
– DVDD......................................................±100 mV
DD
DD
DD
Operating Temperature ............................. –40 to +85 °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 10 Bits
DC Accuracy
Analog Input
MIN
to T
, AVDD=DVDD=OVDD=+5.0 V, VIN=0 to 4 V, ƒS=40 MSPS, V
MAX
=4.0 V, V
RHS
=0.0 V, unless otherwise specified.
RLS
TEST TEST SPT7862
Integral Nonlinearity V ±1.0 LSB
Differential Nonlinearity V ±0.5 LSB
Input Voltage Range IV V
RLS
V
RHS
V
Input Resistance V 29 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
Reference Input
Resistance V 500 Ω
Voltage Range
IV 0 – 2.0 V
IV 3.0 – AV
DD
V 1.0 4.0 5.0 V
∆(V
∆(V
V
V
V
RHF
RLS
RLS
RHS
RHS
– V
– V
– V
RLS
)V90mV
RHS
)V75mV
RLF
Conversion Characteristics
Maximum Conversion Rate VI 40 MHz
Minimum Conversion Rate IV 2 MHz
Pipeline Delay (Latency) IV 12 Clock Cycles
Aperture Delay Time V 4.0 ns
Aperture Jitter Time V 7 ps(rms)
Dynamic Performance
Effective Number of Bits
= 3.58 MHz V 9.1 Bits
ƒ
IN
= 10.0 MHz VI 7.8 8.3 Bits
ƒ
IN
Signal-to-Noise Ratio
(without Harmonics)
= 3.58 MHz V 57.9 dB
ƒ
IN
ƒ
= 10.0 MHz TA = +25 °C I 52 54.2 dB
IN
ƒ
= 10.0 MHz TA = T
IN
MIN
to T
MAX
IV 47 dB
V
SPT
SPT7862
2 2/23/00
ELECTRICAL SPECIFICATIONS
TA=T
MIN
to T
, AVDD=DVDD=OVDD=+5.0 V, VIN=0 to 4 V, ƒS=40 MSPS, V
MAX
=4.0 V, V
RHS
=0.0 V, unless otherwise specified.
RLS
TEST TEST SPT7862
PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Dynamic Performance
Harmonic Distortion 9 Distortion bins from
ƒ
= 3.58 MHz 1024 pt FFT V –63 dB
IN
= 10.0 MHz TA = +25 °C I –55.7 –52 dB
ƒ
IN
= 10.0 MHz TA = T
ƒ
IN
MIN
to T
MAX
IV –52 dB
Signal-to-Noise and Distortion
(SINAD)
= 3.58 MHz V 56.7 dB
ƒ
IN
ƒ
= 10.0 MHz TA = +25 °C I 49 51.8 dB
IN
= 10.0 MHz TA = T
ƒ
IN
MIN
to T
MAX
IV 46 dB
Spurious Free Dynamic Range
ƒ
= 10.0 MHz V 56.8 58.3 60 dB
IN
Differential Phase V ±0.3 Degree
Differential Gain V ±0.3 %
Channel-to-Channel Crosstalk
= 3.58 MHz V 74 dB
ƒ
IN
= 10.0 MHz V 67 dB
ƒ
IN
Inputs
Logic 1 Voltage VI 2.1 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
Digital Outputs
Logic 1 Voltage IOH = 0.5 mA VI OVDD –0.5 V
Logic 0 Voltage I
t
RISE
t
FALL
= 1.6 mA VI 0.44 V
OL
15 pF load V 10 ns
15 pF load V 10 ns
Output Enable to Data
Output Delay 20 pF load, TA = +25 °C V 10 ns
50 pF load over temp. V 22 ns
Power Supply Requirements
Voltages OV
DV
AV
Currents AI
OI
DD
DD
DD
DD
DD
+ DI
DD
IV 3.0 5.0 V
IV 5.0 V
IV 5.0 V
VI 52 62 mA
VI 12 14 mA
Power Dissipation VI 320 380 mW
Power Supply Refection Ratio V 70 dB
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
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 T
= 25 °C. Parameter is guaran-
A
teed over specified temperature range.
SPT
SPT7862
3 2/23/00
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