ADS-946

ADS-946
14-Bit, 8MHz Sampling A/D Converters
PRODUCT OVERVIEW
The low-cost ADS-946 is a 14-bit, 8MHz sampling A/D converter. This device accurately samples
full-scale input signals up to Nyquist frequencies
with no missing codes. Excellent differential nonlinearity error (DNL), signal-to-noise ratio (SNR), and
total harmonic distortion (THD) make the ADS-946
the ideal choice for both time-domain (CCD/FPA
imaging, scanners, process control) and frequencydomain (radar, telecommunications, spectrum
analysis) applications.
The functionally complete ADS-946 contains a
fast-settling sample-hold amplifier, a subranging
(two-pass) A/D converter, an internal reference,
FEATURES
timing/control logic, and error-correction circuitry.
Digital input and output levels are TTL. The ADS946 only requires the rising edge of a start convert
pulse to operate.
Requiring only ±5V supplies, the ADS-946
typically dissipates just 2 Watts. The device is
offered with a bipolar input range of ±2V. Models
are available for use in either commercial (0 to
+70°C), industrial (–40 to +100°C), or HI-REL
(–55 to +125°C) operating temperature ranges. A
proprietary, auto-calibrating, error-correcting circuit
allows the device to achieve specified performance
over the full HI-REL temperature range.
„ 14-bit resolution
„ 8MHz guaranteed sampling rate
„ No missing codes over full HI-REL temperature
range
„ Ideal for both time and frequency-domain
applications
„ Excellent THD (–75dB) and SNR (77dB)
INPUT/OUTPUT CONNECTIONS
FUNCTION
PIN
FUNCTION
BIT 1 (MSB)
24
ANALOG GROUND
BIT 2
23
OFFSET ADJUST
BIT 3
22
+5V ANALOG SUPPLY
BIT 4
21
ANALOG INPUT
BIT 5
20
–5V SUPPLY
BIT 6
19
ANALOG GROUND
BIT 7
18
START CONVERT
BIT 8
17
EOC
BIT 9
16
BIT 14 (LSB)
BIT 10
15
BIT 13
BIT 11
14
DIGITAL GROUND
BIT 12
13
+5V DIGITAL SUPPLY
PIN
1
2
3
4
5
6
7
8
9
10
11
12
„ Edge-triggered; No pipeline delays
„ Small, 24-pin, ceramic DDIP or SMT
„ Requires only ±5V supplies
„ Low-power, 2 Watts
„ MIL-STD-883 screening available
BLOCK DIAGRAM
OFFSET ADJUST 23
BUFFER
16 BIT 14 (LSB)
FLASH
ADC
1
+
15 BIT 13
12 BIT 12
POWER AND GROUNDING
REF
22
+5V DIGITAL SUPPLY
13
–5V SUPPLY
20
ANALOG GROUND
19, 24
DIGITAL GROUND
14
DAC
Σ
AMP
START CONVERT 18
EOC 17
FLASH
ADC
2
REGISTER
+5V ANALOG SUPPLY
11 BIT 11
OUTPUT REGISTER
S/H
DIGITAL CORRECTION LOGIC
–
REGISTER
ANALOG INPUT 21
10 BIT 10
9
BIT 9
8
BIT 8
7
BIT 7
6
BIT 6
5
BIT 5
4
BIT 4
3
BIT 3
2
BIT 2
1
BIT 1 (MSB)
TIMING AND
CONTROL LOGIC
Figure 1. ADS-946 Functional Block Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 1 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
LIMITS
+5V Supply (Pins 13, 22)
0 to +6
–5V Supply (Pin 20)
0 to –6
Digital Input (Pin 18)
–0.3 to +VDD +0.3
Analog Input (Pin 21)
±5
Lead Temperature (10 seconds)
+300
PHYSICAL/ENVIRONMENTAL
PARAMETERS
MIN.
TYP.
MAX.
UNITS
Operating Temp. Range, Case
ADS-946MC, GC, MC-C, GC-C
0
—
+70
°C
ADS-946ME, GE, ME-C, GE-C
–40
—
+100
°C
ADS-946MM, GM, MM-C, GM-C
–55
—
+125
°C
ADS-946MM-QL, 883, MM-QL-C, 883-C
–55
—
+125
°C
Thermal Impedance
θjc
—
6
—
°C/Watt
θca
—
23
—
°C/Watt
Storage Temperature Range
–65
—
+150
°C
Package Type
24-pin, metal-sealed, ceramic DDIP or SMT
Weight
0.42 ounces (12 grams)
UNITS
Volts
Volts
Volts
Volts
°C
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VDD = ±5V, 8MHz sampling rate, and a minimum 3 minute warmup ➀ unless otherwise specified.)
ANALOG INPUT
Input Voltage Range d
Input Resistance
Input Capacitance
DIGITAL INPUT
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Start Convert Positive Pulse Width ➂
STATIC PERFORMANCE
Resolution
Integral Nonlinearity (fin = 10kHz)
Differential Nonlinearity (fin = 10kHz)
Full Scale Absolute Accuracy
Bipolar Zero Error (Tech Note 2)
Gain Error (Tech Note 2)
No Missing Codes (fin = 10kHz)
DYNAMIC PERFORMANCE
Peak Harmonics (–0.5dB)
dc to 500kHz
500kHz to 1MHz
1MHz to 4MHz
Total Harmonic Distortion (–0.5dB)
dc to 500kHz
500kHz to 1MHz
1MHz to 4MHz
Signal-to-Noise Ratio (w/o distortion, –0.5dB)
dc to 500kHz
500kHz to 1MHz
1MHz to 4MHz
Signal-to-Noise Ratio f (& distortion, –0.5dB)
dc to 500kHz
500kHz to 1MHz
1MHz to 4MHz
Noise
Two-Tone Intermodulation Distortion
(fin = 2.45MHz, 1.975MHz, fs = 8MHz, –0.5dB)
Input Bandwidth (–3dB)
Small Signal (–20dB input)
Large Signal (–0.5dB input)
Feedthrough Rejection (fin = 4MHz)
Slew Rate
Aperture Delay Time
Aperture Uncertainty
S/H Acquisition Time (to ±0.003%FSR, 4V step)
Overvoltage Recovery Time ➄
A/D Conversion Rate
MIN.
—
—
—
+25°C
TYP.
±2
200
6
MAX.
—
—
15
MIN.
—
—
—
0 TO +70°C
TYP.
±2
200
6
MAX.
—
—
15
MIN.
—
—
—
–55 TO +125°C
TYP.
±2
200
6
MAX.
—
—
15
UNITS
Volts
Ω
pF
+2.0
—
—
—
10
—
—
—
—
20
—
+0.8
+20
–20
—
+2.0
—
—
—
10
—
—
—
—
20
—
+0.8
+20
–20
—
+2.0
—
—
—
10
—
—
—
—
20
—
+0.8
+20
–20
—
Volts
Volts
μA
μA
ns
—
—
–0.95
—
—
—
14
14
±0.75
±0.5
±0.15
±0.2
±0.2
—
—
—
+1.25
±0.4
±0.4
±0.75
—
—
—
–0.95
—
—
—
14
14
±0.75
±0.5
±0.15
±0.2
±0.2
—
—
—
+1.25
±0.4
±0.4
±0.75
—
—
—
–0.95
—
—
—
14
14
±1
±0.75
±0.4
±0.4
±0.4
—
—
—
+1.5
±0.8
±0.65
±1.25
—
Bits
LSB
LSB
%FSR
%FSR
%
Bits
—
—
—
–76
–75
–75
–72
–72
–71
—
—
—
–76
–75
–75
–72
–72
–71
—
—
—
–74
–74
–69
–70
–68
–65
dB
dB
dB
—
—
—
–75
–75
–75
–71
–70
–70
—
—
—
–75
–75
–75
–71
–70
–70
—
—
—
–74
–72
–69
–70
–68
–64
dB
dB
dB
73
73
73
77
77
77
—
—
—
73
73
73
77
77
77
—
—
—
72
72
71
76
76
76
—
—
—
dB
dB
dB
70
69
69
—
74
73
73
150
—
—
—
—
70
69
69
—
74
73
73
150
—
—
—
—
68
65
65
—
73
70
70
150
—
—
—
—
dB
dB
dB
μVrms
—
–82
—
—
–82
—
—
–82
—
dB
—
—
—
—
—
—
—
—
8
30
10
85
±400
+5
2
55
100
—
—
—
—
—
—
—
60
125
—
—
—
—
—
—
—
—
—
8
30
10
85
±400
+5
2
55
100
—
—
—
—
—
—
—
60
125
—
—
—
—
—
—
—
—
—
8
30
10
85
±400
+5
2
55
100
—
—
—
—
—
—
—
60
125
—
MHz
MHz
dB
V/μs
ns
ps rms
ns
ns
MHz
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 2 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
DIGITAL OUTPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Output Coding
POWER REQUIREMENTS
Power Supply Ranges ➅
+5V Supply
–5V Supply
Power Supply Currents
+5V Supply
–5V Supply
Power Dissipation
Power Supply Rejection
MIN.
+25°C
TYP.
MAX.
MIN.
+2.4
—
—
—
—
—
—
—
—
+0.4
–4
+4
+2.4
—
—
—
+4.75
–4.75
+5.0
–5.0
+5.25
–5.25
+4.75
–4.75
+5.0
–5.0
—
—
—
—
+270
–150
2
—
+290
–170
2.3
±0.05
—
—
—
—
+270
–150
2
—
Footnotes:
➀ All power supplies should be on before applying a start convert pulse. All supplies
and the clock (start convert pulses) must be present during warmup periods. The
device must be continuously converting during this time.
➁ Contact DATEL for other input voltage ranges.
➂ An 8MHz clock with a 20nsec positive pulse width is used for all production
testing. See Timing Diagram, Figure 4, for more details.
➃ Effective bits is equal to:
(SNR + Distortion) – 1.76 +
20 log
0 TO +70°C
TYP.
MAX.
MIN.
–55 TO +125°C
TYP.
MAX.
UNITS
—
—
—
+0.4
—
–4
—
+4
Offset Binary
+2.4
—
—
—
—
—
—
—
—
+0.4
–4
+4
Volts
Volts
mA
mA
+5.25
–5.25
+4.9
–4.9
+5.0
–5.0
+5.25
–5.25
Volts
Volts
+290
–170
2.3
±0.05
—
—
—
—
+270
–150
2
—
+290
–170
2.3
±0.05
mA
mA
Watts
%FSR/%V
➄ This is the time required before the A/D output data is valid once the analog input
is back within the specified range. This time is only guaranteed if the input does
not exceed ±2.2V (S/H saturation voltage).
➅ The minimum supply voltages of +4.9V and –4.9V for ±VDD are required for
–55°C operation only. The minimum limits are +4.75V and –4.75V when operating
at +125°C.
Full Scale Amplitude
Actual Input Amplitude
6.02
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-946 requires careful attention to pc card layout and power supply decoupling. The device’s
analog and digital ground systems are connected to each other internally.
For optimal performance, tie all ground pins (14, 19 and 24) directly to a
large analog ground plane beneath the package. Bypass all power supplies
to ground with 4.7μF tantalum capacitors in parallel with 0.1μF ceramic
capacitors. Locate the bypass capacitors as close to the unit as possible.
2. The ADS-946 achieves its specified accuracies without the need for external calibration. If required, the device’s small initial offset and gain errors
can be reduced to zero using the adjustment circuitry shown in Figures
2 and 3. When using this circuitry, or any similar offset and gain calibration hardware, make adjustments following warmup. To avoid interaction,
always adjust offset before gain.
3. Applying a start convert pulse while a conversion is in progress (EOC =
logic 1) will initiate a new and inaccurate conversion cycle. Data for the
interrupted and subsequent conversions will be invalid.
4. A passive bandpass filter is used at the input of the A/D for all production
testing.
2kΩ
GAIN
ADJUST
+5V
1.98kΩ
SIGNAL
INPUT
To Pin 21
of ADS-946
50Ω
–5V
Figure 2. Optional ADS-946 Gain Adjust Calibration Circuit
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 3 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
CALIBRATION PROCEDURE
Gain Adjust Procedure
Any offset and/or gain calibration procedures should not be implemented
until devices are fully warmed up. To avoid interaction, offset must be
adjusted before gain. The ranges of adjustment for the circuits in Figures
2 and 3 are guaranteed to compensate for the ADS-946's initial accuracy
errors and may not be able to compensate for additional system errors.
1. Apply +1.99963V to the ANALOG INPUT (pin 21).
2. Adjust the gain potentiometer until all output bits are 1's and the LSB flickers between 1 and 0.
3. To confirm proper operation of the device, vary the input signal to obtain
the output coding listed in Table 2.
A/D converters are calibrated by positioning their digital outputs exactly
on the transition point between two adjacent digital output codes. This can
be accomplished by connecting LED’s to the digital outputs and adjusting
until certain LED's "flicker" equally between on and off. Other approaches
employ digital comparators or microcontrollers to detect when the outputs
change from one code to the next.
INPUT VOLTAGE
RANGE
ZERO ADJUST
+½ LSB
GAIN ADJUST
+FS –1½ LSB
±2V
+122μV
+1.99963V
Offset adjusting for the ADS-946 is normally accomplished at the point
where the MSB is a 1 and all other output bits are 0’s and the LSB just
changes from a 0 to a 1. This digital output transition ideally occurs when
the applied analog input is +½ LSB (+122μV).
Table 1. Gain and Zero Adjust
BIPOLAR
SCALE
+FS –1 LSB
+3/4 FS
+1/2 FS
0
–1/2 FS
–3/4 FS
–FS +1 LSB
–FS
Gain adjusting is accomplished when all bits are 1's and the LSB just
changes from a 1 to a 0. This transition ideally occurs when the analog
input is at +full scale minus 1½ LSB's (+1.99963V).
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input (pin 18) so the converter is continuously converting.
2. Apply +122μV to the ANALOG INPUT (pin 21).
–5V
ANALOG
INPUT
+5V ~
4.7μF
+
4.7μF 4.7μF
+ +
0.1μF
0.1μF 0.1μF
20
24
22, 13
14
21
+5V
ZERO/
OFFSET
ADJUST
23
20kΩ
ADS-946
–5V
START
CONVERT
OFFSET BINARY
MSB
LSB
11 1111 1111 1111
11 1000 0000 0000
11 0000 0000 0000
10 0000 0000 0000
01 0000 0000 0000
00 1000 0000 0000
00 0000 0000 0001
00 0000 0000 0000
Table 2. Output Coding for Bipolar Operation
3. Adjust the offset potentiometer until the output bits are 10 0000 0000 0000
and the LSB flickers between 0 and 1.
19
INPUT RANGE
(±2V RANGE)
+1.99976
+1.50000
+1.00000
0.00000
–1.00000
–1.50000
–1.99976
–2.00000
18
1 BIT 1 (MSB)
2 BIT 2
3 BIT 3
4 BIT 4
5 BIT 5
6 BIT 6
7 BIT 7
8 BIT 8
9 BIT 9
10 BIT 10
11 BIT 11
12 BIT 12
15 BIT 13
16 BIT 14 (LSB)
17 EOC
~ A single +5V supply should be used for both the +5V analog and +5V digital.
If separate supplies are used, the difference between the two cannot exceed 100mV.
Figure 3. Typical ADS-946 Connection Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 4 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
THERMAL REQUIREMENTS
overheat. The ground and power planes beneath the package, as well as all
pcb signal runs to and from the device, should be as heavy as possible to help
conduct heat away from the package.
All DATEL sampling A/D converters are fully characterized and specified over
operating temperature (case) ranges of 0 to +70°C and –55 to +125°C. All
room-temperature (TA = +25°C) production testing is performed without the
use of heat sinks or forced-air cooling. Thermal impedance figures for each
device are listed in their respective specification tables.
These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure devices do not
Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than socketed,
and of course, minimal air flow over the surface can greatly help reduce the
package temperature.
N
START
CONVERT
N+1
20ns
typ.
Acquisition Time
10ns typ.
INTERNAL S/H
55ns typ.
60ns max.
70ns typ.
Hold
20ns typ.
EOC
25ns typ.
Conversion Time
78ns min., 85ns typ., 90ns max.
10ns typ.
OUTPUT
DATA
Data N-1 Valid
Data N Valid
95ns typ.
30ns typ.
Invalid Data
Notes:
1. Scale is approximately 5ns per division. Sampling rate = 8MHz.
2. The start convert positive pulse width must be between 10 and 50ns or between 80 and 110ns (when sampling at 8MHz)
to ensure proper operation. For sampling rates less than 8MHz, the start pulse can be wider than 110nsec, however a
minimum pulse width low of 15nsec should be maintained. An 8MHz clock with a 20nsec positive pulse width is used
for all production testing.
Figure 4. ADS-946 Timing Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 5 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
0
Amplitude Relative to Full Scale (dB)
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
0
400
kHz
800
kHz
1.2
MHz
1.6
MHz
2.0
MHz
2.4
MHz
2.8
MHz
3.2
MHz
3.6
MHz
4.0
MHz
Frequency
(fs = 8MHz, fin = 3.85MHz, Vin = –0.5dB, 16,384-point FFT)
Figure 5. FFT Analysis of ADS-946
Number of Occurrences
DNL (LSB's)
+0.81
–0.57
0
0
16,384
Codes
16,384
Digital Output Code
Figure 6. ADS-946 Histogram and Differential Nonlinearity
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 6 of 9
• Tel: (508) 339-3000
•
ANA.
IN
www.datel.com
•
SG10
SG3
SG2
SG1
P4
P2
26
24
22
20
18
16
14
12
10
8
6
4
2
25
23
21
19
17
15
13
11
9
7
5
3
1
ANA. IN
20μH
L7
20μH
L6
20μH
L5
20μH
L4
20μH
L3
20μH
L2
20μH
L1
+
+
+
C9
C2
C11
C4
2.2μF
C5
2.2μF
0.01μF
C14
0.01μF
C7
C13
C6
2.2μF
0.01μF
C12
0.01μF
0.01μF
2.2μF
2.2μF
C10
C3
0.01μF
0.01μF
2.2μF
2.2μF
C8
+5VF
C1
+
+
+
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
+
–5V
+5VA
+15V
–15V
–5VA
+5V
5
(Optional)
4
R2
+15V
10
12
11
13
-15V
SG8
0.1μF
(Optional)
U6
HCT7474
9
Q
8
5
4
13
12
SPARE GATES
0.1μF
C19
(Optional)
-15V
C20
PR
D
CK
CLR
2
R1
C18
0.1μF
(Optional)
SG6
20k
CLC402
HI2541
10
+5VA
OFFSET
ADJUST
-5VA
SG7
6
U4
11
+15V
+5VF
+
–
SG5
11
0.1μF
C15
03 Sep 2015
6
74HCT86
2.2μF
C27
7
8
+5VA
–5V
X1
4
2
3
1
C23
2.2μF
HCT7474
ADS-946
AGND
BIT1 1
OFFSET
BIT2 2
+5VA
BIT3 3
AIN
BIT4 4
-5V
BIT5 5
AGND
BIT6 6
TRIG
BIT7 7
EOC
BIT8 8
BIT14
BIT9 9
BIT13
BIT10 10
BIT11 11
DGND
+5VD
BIT12 12
U1
1
3.2k
R3
0.1μF
C24
+
PR
5
D U6 Q
6
CK
Q
CLR
7
14
+5VF
START CONVERT
24
23
22
21
20
19
18
17
16
15
14
13
+5V
15pF
C25
SG9
14
+5VF
2 3
JPR1
10
9
P3
U5
U5
+
2
3
4
5
6
7
8
9
11
2
3
4
5
6
7
8
9
11
C17
2.2μF
0.1μF
20
Q1
1D
2D
Q2
Q3
3D
4D
Q4
U2 Q5
5D
6D
Q6
Q7
7D
Q8
8D
OE
CE
10
74HCT573
C21
74HCT573
19
18
17
16
15
14
13
12
1
20
Q1 19
1D
18
2D
Q2
Q3 17
3D
16
4D
Q4
15
U3
Q5
5D
6D
Q6 14
13
Q7
7D
Q8 12
8D
1
OE
CE
10
+5VF
+
+5VF
3. SEE DATEL DWG A-24546 FOR ADDITIONAL INFORMATION
ON ADS-B946 EVALUATION BOARD.
2. CLOSE SG1-SG3, SG9, SG10.
1. UNLESS OTHERWISE SPECIFIED ALL CAPACITORS ARE 50V.
C1 - C7 ARE 20V.
ALL RESISTORS ARE IN OHMS.
0.1μF
2.2μF
C16
C22
3
NOTES:
74HCT86
8
74HCT86
2
1
START
CONV.
Figure 7. ADS-946 Evaluation Board Schematic (ADS-B946)
U5
7 GND
U5
SG4
ANA. IN
+5VF
14
C26
0.1μF
8MHz
CRYSTAL
+
OPTION
2 3
JPR2
1
CE
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
TRIG
2
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
P1
1
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
ADS-946
14-Bit, 8MHz Sampling A/D Converters
e-mail: h[email protected]
MDA_ADS-946.C01 Page 7 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
MECHANICAL DIMENSIONS INCHES (mm)
24-Pin DDIP
Versions
1.31 MAX.
(33.27)
ADS-946MC
ADS-946ME
ADS-946MM
ADS-946/883
ADS-946MC-C
ADS-946ME-C
ADS-946MM-C
ADS-946-C/883
24
Dimension Tolerances
(unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
13
0.80 MAX.
(20.32)
1
Lead Material: Kovar alloy
Lead Finish: 50 microinches (minimum)
gold plating over 100 microinches
(nominal) nickel plating
12
0.100 TYP.
(2.540)
1.100
(27.940)
0.235 MAX.
(5.969)
0.200 MAX.
(5.080)
+0.002
0.010 –0.001
(0.254)
0.190 MAX.
(4.826)
0.100
(2.540)
0.040
(1.016)
0.018 ±0.002
(0.457)
24-Pin
Surface Mount
Versions
0.100
(2.540)
0.600 ±0.010
(15.240)
SEATING
PLANE
0.025
(0.635)
1.31 MAX.
(33.02)
0.190 MAX.
(4.826)
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
13
24
ADS-946GC
ADS-946GE
ADS-946GM
ADS-946G/883
ADS-946GC-C
ADS-946GE-C
ADS-946GM-C
ADS-946G-C/883
0.80 MAX.
(20.32)
1
Lead Material: Kovar alloy
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
12
0.020 TYP.
(0.508)
0.060 TYP.
(1.524)
PIN 1
INDEX
0.100
(2.540)
0.100 TYP.
(2.540)
0.015
(0.381)
MAX. radius
for any pin
0.130 TYP.
(3.302)
0.020
(0.508)
0.010 TYP.
(0.254)
0.040
(1.016)
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 8 of 9
ADS-946
14-Bit, 8MHz Sampling A/D Converters
ORDERING INFORMATION
MODEL NUMBER
OPERATING
TEMP. RANGE
0 to +70°C
PACKAGE
ROHS
DDIP
No
ADS-B946
Evaluation Board (without ADS-946)
0 to +70°C
DDIP
Yes
HS-24
Heat Sink for all ADS-946 DDIP models
ADS-946ME
–40 to +100°C
DDIP
No
ADS-946ME-C
–40 to +100°C
DDIP
Yes
ADS-946MC
ADS-946MC-C
ADS-946MM
–55 to +125°C
DDIP
No
ADS-946MM-C
–55 to +125°C
DDIP
Yes
ADS-946MM-QL
–55 to +125°C
DDIP
No
ADS-946MM-QL-C
–55 to +125°C
DDIP
Yes
ADS-946/883
–55 to +125°C
DDIP
No
ADS-946-C/883
–55 to +125°C
DDIP
Yes
ADS-946GC
0 to +70°C
SMT
No
ADS-946GC-C
0 to +70°C
SMT
Yes
ADS-946GE
–40 to +100°C
SMT
No
ADS-946GE-C
–40 to +100°C
SMT
Yes
ADS-946GM
–55 to +125°C
SMT
No
ADS-946GM-C
–55 to +125°C
SMT
Yes
ADS-946G/883
–55 to +125°C
SMT
No
ADS-946G-C/883
–55 to +125°C
SMT
Yes
DATEL is a registered trademark of DATEL, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
ACCESSORIES
Receptacles for pc board mounting can be ordered through AMP,
Inc., Part # 3-331272-8 (Component Lead Socket), 24 required.
For MIL-STD-883 product specifcation, contact DATEL.
DATEL, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information
contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of
licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice.
ITAR and ISO 9001/14001 REGISTERED
© 2015 DATEL, Inc.
www.datel.com • e-mail: [email protected]
03 Sep 2015
MDA_ADS-946.C01 Page 9 of 9