SP8603, SP8605, SP8610
12-Bit Sampling A/D Converters
s
3µs, 5µs or 10µs Sample/Conversion
Time
s
Unipolar 0V to +10V and 0V to +5V
Input
s
No Missing Codes Over Temperature
s
AC Performance Over Temperature
72dB Signal–to–Noise Ratio at Nyquist
85dB Spurious–free Dynamic Range at
49kHz
–81dB Total Harmonic Distortion at 49kHz
s
Internal Sample/Hold, Reference,
Clock, and 3-State Outputs
s
Power Dissipation: 90mW
s
28–Pin Narrow PDIP and SOIC
Packages
DESCRIPTION…
The
SP86XX Series
are complete, unipolar, 12-bit sampling A/D converters using state-of-the-art
CMOS structures. They contain a complete 12-bit successive approximation A/D converter with
internal sample/hold, reference, clock, digital interface for microprocessor control, and three-state
output drivers. Power dissipation is only 90mW. AC and DC performance are completely
specified. Sampling/conversion rates of 3µs, 5µs and 10µs are offered.
CS
R/C HBE
Control
Logic
Clock
SAR
Output
Latches
And
Three
State
Drivers
Comparator
BUSY
0V to10V
IN
0V to 5V
IN
Internal
Ref
V
REF
Output
(1.2043V)
CDAC
.....
.....
.....
.....
Three
State
Parallel
Output
Data
Bus
79
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device
at these or any other above those indicated in the operation
sections of the specifications below is not implied. Exposure to
absolute maximum rating conditions for extended periods of time
may affect reliability.
V
S
to Digital Common ............................................................... +7V
Pin 26 (V
SO
) to Pin 27 (V
SA
) ....................................................
±0.3V
Analog Common to Digital Common ......................................
±0.3V
Control Inputs to Digital Common ....................... –0.3 to V
S
+ 0.3 V
Analog Input Voltage ................................................... –3.0/+16.5V
Maximum Junction Temperature ........................................... 160°C
Internal Power Dissipation .................................................. 750mW
Lead Temperature (soldering, 10s) ..................................... +300°C
Thermal Resistance. Ø
JA
:
Plastic DIP ....................................................................... 50°C/W
SOIC .............................................................................. 100°C/W
SPECIFICATIONS
(T
A
= 25°C; Sampling Frequency, F
S
, = 333kHz for SP8603, 200kHz for SP8605, 100kHz for SP8610, V
S
= +5V, unless otherwise specified.)
PARAMETER
MIN.
TYP.
MAX.
UNITS
V
kΩ
kΩ
CONDITIONS
Unipolar
T
MIN
≤
T
A
≤
T
MAX
T
MIN
≤
T
A
≤
T
MAX
Externally adjustable to zero;
T
MIN
≤
T
A
≤
T
MAX
Note 1
ANALOG INPUT
Voltage Ranges
0V to +5V, 0V to +10V
Impedance
0 to +10V Range
5.4
7.7
10.0
0 to +5V Range
3.9
5.6
7.3
DC PERFORMANCE
Full Scale Error
–K
±0.1
±0.50
Integral Linearity Error
–K
±0.35
±0.75
Differential Linearity Error
–K
±0.35
±0.95
No Missing Codes
Guaranteed
Unipolar Zero
–K
±1
±5
INTERNAL REFERENCE
Voltage Output
1.1440 1.2043 1.2645
Output Source Current
100
Output Resistance
280
AC PERFORMANCE
SP8603
Conversion Time
2.6
Complete Cycle
3.0
Throughput Rate
333
Spurious-Free Dynamic Range
@ 49kHz
85
@ 161kHz
72
Total Harmonic Distortion
@ 49kHz
–81
@ 161kHz
–71
Signal to Noise Ratio (SNR)
@ 49kHz
72
@ 161kHz
72
Signal to (Noise + Distortion) Ratio
@ 49kHz
71
@ 161kHz
68
SP8605
Conversion Time
4.5
Complete Cycle
5.0
Throughput Rate
200
Spurious-Free Dynamic Range
@ 49kHz
85
@ 97kHz
77
Total Harmonic Distortion
@ 49kHz
–81
@ 97kHz
–76
%FSR
LSB
LSB
LSB
V
µA
Ω
Externally adjustable to zero
T
MIN
≤
T
A
≤
T
MAX
T
MIN
≤
T
A
≤
T
MAX
µs
µs
kHz
Note 2
dB
dB
Note 2
dB
dB
Note 2
dB
dB
Note 2
dB
dB
µs
µs
kHz
Note 2
dB
dB
Note 2
dB
dB
80
SPECIFICATIONS
(T
A
= 25°C; Sampling Frequency, F
S
, = 333kHz for SP8603, 200kHz for SP8605, 100kHz for SP8610, V
S
= +5V, unless otherwise specified.)
PARAMETER
MIN.
AC PERFORMANCE
SP8605
Signal to Noise Ratio (SNR)
@ 49kHz
@ 97kHz
Signal to (Noise + Distortion) Ratio
@ 49kHz
@ 97kHz
SP8610
Conversion Time
Complete Cycle
10.0
Throughput Rate
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal to Noise Ratio (SNR)
Signal to (Noise + Distortion) Ratio
TYP.
MAX.
UNITS
CONDITIONS
T
MIN
≤
T
A
≤
T
MAX
Note 2
72
72
71
70
9.5
100
85
–81
72
71
dB
dB
Note 2
dB
dB
µs
µs
kHz
dB
dB
dB
dB
@ 49kHz; Note 2
@ 49kHz; Note 2
@ 49kHz; Note 2
@ 49kHz; Note 2
SAMPLING DYNAMICS
Aperture Delay
13
Aperture Jitter
150
Transient Response
–K
150
Overvoltage Recovery
150
DIGITAL INPUTS
Logic Levels
V
IL
–0.3
+0.8
V
IH
+2.4
+5.3
I
IL
±0.1
±50
I
IH
±5
DIGITAL OUTPUTS
Resolution
12
Data Format
Parallel; 12-bit or 8-bit/4-bit
Data Coding
Binary
0.0
+0.4
V
OL
V
OH
+2.4
V
DD
I
LEAKAGE
(High-Z State)
±0.1
±5
POWER SUPPLY REQUIREMENTS
Rated Voltage
+4.75
+5.0
+5.25
Current
18
21
Power Consumption
90
ENVIRONMENTAL AND MECHANICAL
Specification
–K
0
+70
Storage
Package
–KN
–KS
–65
+150
ns
ps, rms
Note 3
ns
ns
Note 4
V
V
µA
µA
Bits
V
V
µA
V
mA
mW
I
SINK
= 1.6mA
I
SOURCE
= 1.6mA
V
S
(V
SA
and V
SD
)
I
S
°C
°C
28–pin Narrow DIP
28–pin SOIC
NOTES
1.
LSB means Least Significant Bit. For
SP86xx Series,
1LSB = 1.22mV for 5V range, 1 LSB =
2.44mV for 10V range.
2.
All specifications in dB are referred to a full-scale input, either 10V or 5V.
3.
For full-scale step input, 12-bit accuracy attained in specified time.
4.
Recovers to specified performance in specified time after 2 x F
S
input overvoltage.
81
PINOUT
N.C. 1
±10V IN 2
±5V IN 3
VREF 4
AGND 5
D
11
D
10
D
9
D
8
6
7
8
9
28 N.C.
27 V
SA
26 V
SD
25 N.C.
24 BUSY
23 CS
22 R/C
21 HBE
20 D
0
19 D
1
18 D
2
17 D
3
16 DGND
15 N.C.
HBE is HIGH.
Pin 13 — D
4
— Data Bit 4 if HBE is LOW; LOW if
HBE is HIGH.
Pin 14 —N.C.—This pin is not internally connected.
Pin 15 —N.C.—This pin is not internally connected.
Pin 16— DGND — Digital Ground. Connect to
pin 5 at the device.
Pin 17 — D
3
— Data Bit 3 if HBE is LOW; Data Bit
11 if HBE is HIGH.
Pin 18 — D
2
— Data Bit 2 if HBE is LOW; Data Bit
10 if HBE is HIGH.
Pin 19— D
1
— Data Bit 1 if HBE is LOW; Data Bit
9 if HBE is HIGH.
SP8603
SP8605
SP8610
D
7
10
D
6
11
D
5
12
D
4
13
N.C. 14
PIN ASSIGNMENT
Pin 1 —No Connection —This pin is not internally
connected.
Pin 2 — IN
1
— 0V to 10V Analog Input. Connected
to AGND for 10V range.
Pin 3 — IN
2
— 0V to 5V Analog Input. Connected
to AGND for 5V range.
Pin 4 — V
REF
– Internal Voltage. Reference Output.
Pin 5 — AGND — Analog Ground. Connect to
pin 16 at the device.
Pin 6 — D
11
— Data Bit 11. Most Significant Bit
(MSB).
Pin 7 — D
10
— Data Bit 10.
Pin 8— D
9
— Data Bit 9.
Pin 9 — D
8
— Data Bit 8.
Pin 10 — D
7
— Data Bit 7 if HBE is LOW; LOW if
HBE is HIGH.
Pin 11 — D
6
— Data Bit 6 if HBE is LOW; LOW if
HBE is HIGH.
Pin 12 — D
5
— Data Bit 5 if HBE is LOW; LOW if
82
Pin 20 — D
0
— Data Bit 0 if HBE is LOW. Least
Significant Bit (LSB). Data Bit 8 if HBE is HIGH.
Pin 21 — HBE — High Byte Enable, When held
LOW, data output as 12-bits in parallel. When
held HIGH, four MSBs presented on pins 17–
20, pins 10 – 13 output LOWs. Must be LOW to
initiate conversion.
Pin 22— R/C — Read/Convert. Falling edge initiates
conversion when CS is LOW, HBE is LOW, and
BUSY is HIGH.
Pin 23 — CS — Chip Select. Outputs in Hi-Z state
when HIGH. Must be LOW to initiate conversion or
read data.
Pin 24 — BUSY — Output LOW during
conversion. Data valid on rising edge in Con-
vert Mode.
Pin 25 — N.C. — This pin is not internally connected.
Pin 26 — V
SD
— Positive Digital Power Supply, +5V.
Connect to pin 27, and bypass to DGND.
Pin 27 — V
SA
— Positive Analog Power Supply.
+5V. Connect to pin 26, and bypass to AGND.
Pin 28 — N.C. — This pin is not internally connected.
FEATURES...
The
SP86XX Series
are specified at sampling
rates of 333kHz (SP8603), 200kHz (SP8605) or
100kHz (SP8610). Conversion times are factory
set for 2.70µs, 4.7µs and 9.7µs maximum, re-
spectively, over temperature, and the high-
speed sampling input stage insures a total acqui-
sition and conversion time of 3µs, 5µs and 10µs
maximum, respectively, over temperature. Pre-
cision, laser-trimmed scaling resistors provide
industry-standard input ranges of 0V to +5V or
0V to +10V.
The 28-pin
SP86XX Series
are available in
narrow plastic DIP, and SOIC packages and it
operates from a single +5V supply. The
SP86XX
Series
are available in grades specified over the
0°C to +70°C commercial temperature ranges.
after the conversion is completed and the data has
been transferred to the output drivers. Thus, the
rising edge can be used to read the data from the
conversion. Also, during conversion, the BUSY
signal puts the output data lines in Hi-Z states and
inhibits the input lines. This means that pulses on
R/C are ignored, so that new conversions cannot be
initiated during a conversion.
The
SP86XX Series
will begin acquiring a new
sample just prior to the BUSY output rising, and
will track the input signal until the next conversion
is started.
In the Read Mode, R/C is kept normally LOW, and
a HIGH pulse is used to read data and initiate a
conversion. In this mode, the rising edge of R/C
will enable the output data pins, and the data from
the previous conversion becomes valid. The fall-
ing edge then puts the
SP86XX Series
in a hold
mode, and initiates a new conversion.
For use with an 8-bit bus, the data can be read out in two
bytes under the control of HBE. With a LOW input
on HBE, at the end of a conversion, the 8 LSBs of data
are loaded into the output drivers on D
7
through D
4
and
D
3
through D
0
. Taking HBE HIGH then loads the 4
MSBs on D
3
through D
0
, with D
7
through D
4
being
forced LOW.
Analog Input Ranges
The
SP86XX Series
offers two standard unipolar
input ranges: 0V to +10V and 0V to +5V. If a 10V
unipolar range is required, the analog input signal
should be connected to pin 2. A signal requiring a
5V unipolar range should be connected to pin 3. In
either case, the other pin of the two must be
grounded or connected to the adjustment circuits
described in the section on calibration.
Controlling The SP86XX Series
The
SP86XX Series
can be easily interfaced to most
microprocessor-based and other digital systems. The
microprocessor may take full control of each conver-
sion, or the
SP86XX Series
may operate in a stand-
alone mode, controlled only by the R/C input. Full
control consists of initiating the conversion and read-
ing the output data at user command, transmitting data
either all 12-bits in one parallel word, or in two 8-bit
bytes. The three control inputs (CS, R/C and HBE) are
all TTL/CMOS compatible. The functions of the
83
OPERATION
Basic Operation
Figure 1
shows the simple hookup circuit required
to operate the
SP86XX Series
in a 0V to +10V
range in the Convert Mode. A convert command
arriving on R/C puts the
SP86XX Series
in the
HOLD mode, and a conversion is started. This
pulse must be LOW for a minimum of 40ns.
Because this pulse establishes the sampling instant
of the A/D, it must have very low jitter. BUSY will
be held LOW during the conversion, and rises only
1
2
Input
3
4
5
6
7
8
9
N.C.
IN 1
IN 2
V
REF
AGND
N.C. 28
+5V 27
+5V 26
N.C. 25
BUSY 24
Busy
D11 (MSB)
D10
D9
D8
CS 23
R/C 22
HBE 21
D0 (LSB) 20
D1 19
D2 18
D3 17
DGND 16
N.C. 15
D0
(LSB)
Convert
Command
6.8µF +
+5V
0.1µF
10 D7
11 D6
12 D5
13 D4
14 N.C.
D11
(MSB)
Data
Out
Figure 1. Basic 0V to 10V Operation
