ADS-945

ADS-945
14-Bit, 10MHz Sampling A/D Converters
PRODUCT OVERVIEW
The low-cost ADS-945 is a high-performance,
14-bit, 10MHz sampling A/D converter. This
device accurately samples full-scale input signals
up to Nyquist frequencies with no missing codes.
The dynamic performance of the ADS-945
has been optimized to achieve a THD of –80dB
and a SNR of 75dB.
Packaged in a 2" x 4" module, the functionally complete ADS-945 contains a fast-settling
sample/hold amplifier, a subranging (two-pass)
A/D converter, a precise voltage reference, timing/
control logic, three-state outputs, and errorcorrection circuitry. Digital inputs and outputs are
TTL compatible (except for pins 29 and 30 which
are ECL).
Requiring ±15V, +5V and –5.2V supplies,
the ADS-945 typically dissipates 4.0W. The unit
is offered with a bipolar input range of ±1.25V.
Models are available for use in either commercial
(0 to +70°C) or military (–55 to +125°C) operating temperature ranges. Typical applications
include radar signal analysis, medical/graphic
imaging, and FFT spectrum analysis.
FEATURES
14-bit resolution
10MHz minimum throughput
Functionally complete
No missing codes
Low power, 4.0W
Excellent dynamic performance
Internally clamped input
Edge triggered
TTL compatible
2" x 4" module
Very low profile
PIN
1
4
5-6
7
8
9
10-11
12
13
14
15-17
18
19-25
26
27
28
29
30
31
32
33
34
35
36
37
38
INPUT/OUTPUT CONNECTIONS
FUNCTION
PIN
FUNCTION
ANALOG GROUND
70-76 ANALOG GROUND
ANALOG INPUT
69
+5V ANALOG SUPPLY
ANALOG GROUND
64-68 ANALOG GROUND
+10V REFERENCE OUT
63
–5.2V ANALOG SUPPLY
ANALOG GROUND
62
ANALOG GROUND
GAIN ADJUST
61
NO CONNECT
DO NOT CONNECT
58-60 DIGITAL GROUND
–15V SUPPLY
57
–5.2V DIGITAL SUPPLY
ANALOG GROUND
56
DO NOT CONNECT
+15V SUPPLY
55
+5V DIGITAL SUPPLY
ANALOG GROUND
54
DIGITAL GROUND
OFFSET ADJUST
53
BIT 1 (MSB)
ANALOG GROUND
52
BIT 2
MISSING PIN
51
BIT 3
DIGITAL GROUND
50
BIT 4
DIGITAL GROUND
49
BIT 5
T/H STATUS
48
BIT 6
T/H STATUS
47
BIT 7
DIGITAL GROUND
46
BIT 8
START CONVERT
45
BIT 9
OVERFLOW
44
BIT 10
OUTPUT ENABLE (OE)
43
BIT 11
DIGITAL GROUND
42
BIT 12
NO CONNECT
41
BIT 13
DIGITAL GROUND
40
BIT 14 (LSB)
DIGITAL GROUND
39
DIGITAL GROUND
BLOCK DIAGRAM
33 OVERFLOW
BUFFER
53 BIT 1 (MSB)
FLASH
ADC
1
T/H
GAIN
CIRCUIT
GAIN ADJUST 9
52 BIT 2
REF
DAC
+10 REF. OUT 7
CASE
3
1,2,3,5,6,8,13,15,17,
19-25,62,64-68,70-76
ANALOG GROUND
AGND
DGND
OFFSET
CIRCUIT
OFFSET ADJUST 18
FLASH
ADC
2
AMP
51 BIT 3
3-STATE OUTPUT REGISTER
+1
DIGITAL CORRECTION LOGIC
ANALOG INPUT 4
50 BIT 4
49 BIT 5
48 BIT 6
47 BIT 7
46 BIT 8
45 BIT 9
44 BIT 10
43 BIT 11
42 BIT 12
41 BIT 13
40 BIT 14 (LSB)
START CONVERT 32
34 OUTPUT ENABLE
TIMING AND
CONTROL LOGIC
T/H STATUS 29
26 MISSING PIN
T/H STATUS 30
10,11,56 DO NOT CONNECT
12
14
27,28,31,35,37-39,54,58-60
36, 61
55
57
–15V
SUPPLY
+15V
SUPPLY
DIGITAL
GROUND
NO
CONNECT
+5V DIGITAL
SUPPLY
–5.2V DIGITAL
SUPPLY
Figure 1. ADS-945 Functional Block Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
21 Aug 2015
MDA_ADS-945.B03 Page 1 of 8
ADS-945
14-Bit, 10MHz Sampling A/D Converters
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
LIMITS
+15V Supply (Pins 14)
0 to +16
–15V Supply (Pin 12)
0 to –16
+5V Supply (Pins 55, 69)
0 to +6
–5V Supply (Pin 57, 63)
0 to –6
Digital Input (Pin 32, 34)
–0.3 to +VDD +0.3
Analog Input (Pin 4)
–15 to +15
Lead Temperature (10 seconds)
+300
UNITS
Volts
Volts
Volts
Volts
Volts
Volts
°C
PARAMETERS
Operating Temp. Range, Case
ADS-945
ADS-945EX
Thermal Impedance
θjc
θca
Storage Temperature Range
Package Type
Weight
PHYSICAL/ENVIRONMENTAL
MIN.
TYP.
0
–55
—
—
—
—
–65
MAX.
UNITS
+70
+125
°C
°C
10
—
8
—
—
+150
2" x 4" module
2.1 oz. (60 grams)
°C/Watt
°C/Watt
°C
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = ±15V, +VDD = +5V,VDD = –5.2V, 10MHz sampling rate, and a minimum 10 minute warmup ➀ unless otherwise specified.)
ANALOG INPUT
Input Voltage Range d
Input Resistance
Input Capacitance
Input Bias Current
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 (dc input)
Differential Nonlinearity (fin = 10kHz)
Full Scale Absolute Accuracy
Bipolar Offset Error (Tech Note 2)
Gain Error (Tech Note 2)
No Missing Codes (fin = 10kHz)
DYNAMIC PERFORMANCE
Peak Harmonics (–0.5dB)
dc to 1mHz
1MHz to 2.5MHz
2.5MHz to 5MHz
Total Harmonic Distortion (–0.5dB)
dc to 1MHz
1MHz to 2.5MHz
2.5MHz to 5MHz
Signal-to-Noise Ratio (w/o distortion, –0.5dB)
dc to 1MHz
100kHz to 2.5MHz
2.5MHz to 5MHz
Signal-to-Noise Ratio f (& distortion, –0.5dB)
dc to 100kHz
1MHz to 2.5MHz
2.5MHz to 5MHz
Noise
Two-Tone Intermodulation Distortion
(fin = 2.45MHz, 1.975MHz, fs = 10MHz, –0.5dB)
Input Bandwidth (–3dB)
Small Signal (–20dB input)
Large Signal (–0.5dB input)
Feedthrough Rejection (fin = 4.85MHz)
Slew Rate
Aperture Delay Time
Aperture Uncertainty
S/H Acquisition Time ( to ±0.003%FSR, 2.5V step)
Overvoltage Recovery Time ➄
A/D Conversion Rate
MIN.
—
300
—
—
+25°C
TYP.
±1.25
500
10
±3
MAX.
—
—
15
—
MIN.
—
300
—
—
0 TO +70°C
TYP.
±1.25
500
10
±3
MAX.
—
—
15
—
MIN.
—
300
—
—
–55 TO +125°C
TYP.
±1.25
500
10
±3
MAX.
—
—
15
—
UNITS
Volts
kΩ
pF
μA
+2.0
—
—
—
10
—
—
—
—
50
—
+0.8
+20
–20
—
+2.0
—
—
—
10
—
—
—
—
50
—
+0.8
+20
–20
—
+2.0
—
—
—
10
—
—
—
—
50
—
+0.8
+20
–20
—
Volts
Volts
μA
μA
ns
—
—
–0.99
—
—
—
14
14
±0.5
±0.5
±0.2
±0.15
±0.1
—
—
—
+1.5
±0.4
±0.25
±0.2
—
—
—
–0.99
—
—
—
14
14
±0.75
±0.5
±0.3
±0.25
±0.2
—
—
—
+1.5
±0.5
±0.5
±0.4
—
—
—
–0.99
—
—
—
14
14
±1
±0.75
±0.3
±0.3
±0.3
—
—
—
+2.5
±0.7
±0.7
±0.7
—
Bits
LSB
LSB
%FSR
%FSR
%
Bits
—
—
—
–80
–80
–79
–75
–75
–73
—
—
—
—
—
–79
—
—
–73
—
—
—
—
—
–75
—
—
–69
dB
dB
dB
—
—
—
–80
–80
–78
–75
–74
–71
—
—
—
—
—
–78
—
—
–71
—
—
—
—
—
–75
—
—
–68
dB
dB
dB
71
71
70
75
75
74
—
—
—
—
—
69
—
—
74
—
—
—
—
—
67
—
—
72
—
—
—
dB
dB
dB
70
70
69
—
77
74
73
110
—
—
—
—
—
—
69
—
—
—
73
110
—
—
—
—
—
—
65
—
—
—
70
110
—
—
—
—
dB
dB
dB
μVrms
—
–84
—
—
–84
—
—
–84
—
dB
—
—
—
—
—
—
—
—
10
100
50
90
±650
±8
2
40
30
—
—
—
—
—
—
—
—
100
—
—
—
—
—
—
—
—
—
10
100
50
90
±650
±8
2
40
30
—
—
—
—
—
—
—
—
100
—
—
—
—
—
—
—
—
—
10
100
50
90
±650
±8
2
40
30
—
—
—
—
—
—
—
—
100
—
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]
21 Aug 2015
MDA_ADS-945.B03 Page 2 of 8
ADS-945
14-Bit, 10MHz Sampling A/D Converters
ANALOG OUTPUT
Reference Output
Reference Temperature Drift
Reference Load Current
DIGITAL OUTPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Delay, Rising Edge of Start Convert to Output Data Valid
Delay, Edge of ENABLE to Output Data Valid/Invalid
Output Coding
POWER REQUIREMENTS
Power Supply Ranges
+15V Supply
–15V Supply
+5V Supply
–5.2V Supply
Power Supply Currents ➅
+15V Supply
–15V Supply
+5V Supply
–5.2V Supply
Power Dissipation
Power Supply Rejection
MIN.
+9.95
—
—
+25°C
TYP.
+10
±40
—
MAX.
+10.05
—
2.0
MIN.
+9.95
—
—
+2.7
—
—
—
—
—
—
—
—
—
—
—
—
+0.5
–0.4
–8
35
18
+2.7
—
—
—
—
—
+14.25
–14.25
+4.75
–4.95
+15.0
–15.0
+5.0
–5.2
+15.75
–15.75
+5.25
–5.45
+14.25
–14.25
+4.75
–4.95
+15.0
–15.0
+5.0
–5.2
—
—
—
—
—
—
+35
–10
+290
–350
4.0
—
+45
–20
+320
–390
4.3
±0.04
—
—
—
—
—
—
+35
–10
+290
–350
4.0
—
Footnotes:
➀ All power supplies must be on before applying a start convert pulse. All supplies
and the clock (START CONVERT) must be present during warmup periods. The
device must be continuously converting during this time.
➁ The input to the ADS-945 is internally clamped at ±2.3V.
➂ An 50ns wide start convert pulse is used for all production testing. For applications
requiring less than a 10MHz sampling rate, a wider start convert can be used.
➃ Effective bits is equal to:
(SNR + Distortion) – 1.76 +
20 log
0 TO +70°C
TYP.
+10
±40
—
MAX.
+10.05
—
2.0
MIN.
+9.95
—
—
—
—
—
+0.5
—
–0.4
—
–8
—
35
—
18
Complementary Offset Binary
–55 TO +125°C
TYP.
MAX.
+10
+10.05
±40
—
—
2.0
UNITS
Volts
ppm/°C
mA
+2.7
—
—
—
—
—
—
—
—
—
—
—
—
+0.5
–0.4
–8
35
18
Volts
Volts
mA
mA
ns
ns
+15.75
–15.75
+5.25
–5.45
+14.25
–14.25
+4.9
–5.1
+15.0
–15.0
+5.0
–5.2
+15.75
–15.75
+5.25
–5.45
Volts
Volts
Volts
Volts
+45
–20
+320
–390
4.3
±0.04
—
—
—
—
—
—
+35
–10
+290
–350
4.0
—
+45
–20
+320
–390
4.3
±0.04
mA
mA
mA
mA
Watts
%FSR/%V
➄ This is the time required before the A/D output data is valid after the analog input
is back within the specified range.
➅ Typical +5V and –5.2V current drain breakdowns are as follows:
+5V Analog = +195mA
–5.2V Analog = –170mA
+5V Digital = + 95mA
–5.2V Digital = –180mA
+5V Total = +290mA
–5.2V Total = –350mA
Full Scale Amplitude
Actual Input Amplitude
6.02
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-945 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 directly to a large analog ground
plane beneath the package.
Bypass all power supplies to ground with 10μF tantalum capacitors in
parallel with 0.1μF ceramic capacitors. The bypass capacitors should be
located as close to the unit as possible.
2. The ADS-945 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 Figure 2.
The typical adjustment range is ±0.2%FSR for this circuitry.
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
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. To enable the three-state outputs, apply a logic "0" (low) to OUTPUT
ENABLE (pin 34). To disable, apply a logic "1" (high) to pin 34.
4. A passive bandpass filter is used at the input of the A/D for all production
testing.
5. The ADS-945's digital outputs should not be directly connected to a noisy
data bus. Drive the bus with 573 or 574 type latches and use "low-noise"
logic, such as the 74ALS series.
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
21 Aug 2015
MDA_ADS-945.B03 Page 3 of 8
ADS-945
14-Bit, 10MHz Sampling A/D Converters
CALIBRATION PROCEDURE (Refer to Figure 2 and Table 1)
Zero/Offset Adjust Procedure
Note: Connect pin 18 to ANALOG GROUND (pin 19) for operation without zero/offset adjustment. Connect pin 9 to ANALOG GROUND (pin 8)
for operation without gain adjustment.
1. Apply a train of pulses to the START CONVERT input (pin 32) so the converter is continuously converting.
2. Apply +76.3μV to the ANALOG INPUT (pin 4).
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 circuit in Figure 2
are guaranteed to compensate for the ADS-945's initial accuracy errors and
may not be able to compensate for additional system errors.
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.
For the ADS-945, offset adjusting 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 (+76.3μV).
Gain adjusting is accomplished when all bits are 0's and the LSB just
changes from a 0 to a 1. This transition ideally occurs when the analog
input is at +full scale minus 1 ½ LSB's (+1.249771V).
3. Adjust the offset potentiometer until the output bits are 10 0000 0000 0000
and the LSB flickers between 0 and 1.
Gain Adjust Procedure
1. Apply +1.249771V to the ANALOG INPUT (pin 4).
2. Adjust the gain potentiometer until all output bits are 0's and the LSB flickers between 0 and 1.
3. To confirm proper operation of the device, vary the applied input voltage to
obtain the output coding listed in Table 1.
Note: A single +5V supply can be used for both the +5V ANALOG and
the +5V DIGITAL. If separate supplies are used, the difference between
the two can not exceed 100mV. This also applies to the –5.2V supply
requirements.
Datel recommends using ferrite beads to separate the analog and digital supplies (FAIR-RITE # 2643000301).
Table 1. Output Coding
OUTPUT CODING
MSB
LSB
00 0000 0000 0000
00 0111 1111 1111
00 1111 1111 1111
01 1111 1111 1111
10 1111 1111 1111
11 0111 1111 1111
11 1111 1111 1110
11 1111 1111 1111
Note: Due to inherent system noise, the averaging of several conversions may be needed to accurately adjust both offset and gain to
1LSB of accuracy.
0.1μF
54
DIGITAL
58-60 GROUND
0.1μF
57 DIGITAL
SUPPLY
+
10μF
10μF
–5.2V
10μF
64-68
+
0.1μF
10μF
0.1μF
–5.2V
10μF
ANALOG
GROUND
ANALOG
63 SUPPLY
40
34
33
30
29
ADS-945
+
0.1μF
13
ANALOG
15-17 GROUND
10μF
START CONVERT 32
13
–15V
BIT 14 (LSB)
OUTPUT ENABLE
OVERFLOW
T/H STATUS
T/H STATUS
4 ANALOG INPUT
12
+
+15V
48 BIT 6
47 BIT 7
46 BIT 8
45 BIT 9
44 BIT 10
43 BIT 11
42 BIT 12
41 BIT 13
69 ANALOG
SUPPLY
+
+5V
BIPOLAR
SCALE
+FS –1 LSB
+3/4 FS
+1/2FS
0
–1/2FS
–3/4FS
–FS +1 LSB
–FS
53 BIT 1 (MSB)
52 BIT 2
51 BIT 3
50 BIT 4
49 BIT 5
55 DIGITAL
SUPPLY
+
+5V
INPUT RANGE
±1.25V
+1.249847
+0.937500
+0.625000
0.000000
–0.625000
–0.937500
–1.249847
–1.250000
+10 REF. OUT 7
+15V
+15V
OFFSET
18 ADJUST
20k7
GAIN
ADJUST
0.1μF
9
20k7
0.1μF
–15V
–15V
Figure 2. ADS-945 Connection Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
21 Aug 2015
MDA_ADS-945.B03 Page 4 of 8
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
3
1
2
11
12
5
13
14
4
15
16
6
17
18
9
19
20
7
21
22
8
23
24
10
25
26
P1
POWER SUPPLY
CONNECTOR
+5VA
+15V
-15V
-5.2V
+5VD
-5.2VD
-5.2V D
+15V
L6
L5
L4
L3
L2
L1
-5.2VA
0.1" GRID
HOLE PATTERN
+5VA
-15V
D4
D3
D2
D1
C1
+
+
C4
C3
+
C2
+
+5VD
+15V/50MA
-15V/80MA
+5VA/350MA
-5.2VA
P3
C26
NC
1
JPR3
• Tel: (508) 339-3000
•
14
www.datel.com
•
21 Aug 2015
JPR2
CLOCK
R1
20K
2
R3
51.1
3 EXT
2
1 INT
GAIN
1
+15V
-15V
3 CW
C14
7
8
1
+V
C23
6
2
EXT
C9
10PF
(OPT)
C17
C16
3
JPR1
OUTPUT ENABLE
1
-V
INT
-5.2V D
4
-15V
OFFSET
3 CW
R2
20K
2
3
U4
LT1016 2
5
C22
+5V D
1
+15V
-15V
C15
+15V
9
38
37
36
35
34
33
32
31
30
29
28
T/H
OS3
ENABLE
O.F.
CLOCK
T/H
44
(LSB) BIT 14 40
39
BIT 11 43
42
BIT 12
BIT 13 41
BIT 10
BIT 7 47
46
BIT 8
BIT 9 45
BIT 6
48
BIT 4 50
BIT 5 49
27
26
25
(MSB) BIT 1 53
52
BIT 2
BIT 3 51
+5VD 55
54
24
23
22
21
-5.2VD 57
DNC 56
59
60
61
62
20
-5.2VA
63
64
65
66
67
68
58
OFFSET
+15V
-15V
GAIN
19
18
17
16
15
14
13
12
11
10
69
L10
+5VA
C20
-5.2VA
+5VD
SG1 C21
L11
-5.2VD
SG3
C19
C18
-5.2VA
+5VA
Figure 3. ADS-945 Evaluation Board Schematic (DATEL Dwg. #A-23442)
8
X1
10MHZ
+5V D
1,7
R5
51.1
P4
EXT. CLOCK
2
3
+5VA
70
7
8
71
6
VREF
72
73
5
74
IN
75
76
4
U1
ADS945
3
2
1
+
C29
C27
U7
+5V
Q3
Q2
Q1
17
18
19
C28
DATA
LATCHES
R12
10K
10
16
Q4
6 5D ALS573
15
Q5
7 6D
14
Q6
8 7D
13
Q7
9 8D
12
Q8
11 CP
1
GND OC
4 3D
5 4D
2 1D
3 2D
20
10
20
2 1D +5V
19
Q1
3 2D
18
Q2
4 3D
17
Q3
5 4D U6
16
Q4
ALS573
6
15
5D
Q5
7 6D
14
Q6
8 7D
13
Q7
9 8D
12
Q8
11 CP
1
GND OC
+5VD
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
AGND
EOC
CLOCK
OVERFLOW
2
4
6
8
10
1 ENABLE
3
5
7
9
11
BIT 13
13
BIT 12 12
15
17
BIT 11 14
BIT 10 16
BIT 9 18
21
23
25
27
29
31
33
19
22
24
26
28
30
32
34
P2
DATA OUTPUT
CONNECTOR
DGND
SG4
20
AGND
LSB BIT 14
SG2
MSB BIT 1
DGND
L7
ADS-945
14-Bit, 10MHz Sampling A/D Converters
e-mail: [email protected]
MDA_ADS-945.B03 Page 5 of 8
ADS-945
14-Bit, 10MHz Sampling A/D Converters
N
START
CONVERT
N+1
N+2
50ns typ.
Acquisition Time
10ns typ.
Hold
T/H
40ns typ.
60ns typ.
T/H
Hold
Hold
35ns max.
10ns typ.
OUTPUT
DATA
DATA N-1 VALID
DATA N VALID
INVALID
DATA
90ns typ.
DATA N+1 VALID
Note: Scale is approximately 10ns per division.
Figure 4. ADS-945 Timing Diagram
TIMING NOTES
1. The ADS-945 is an edge-triggered device requiring no additional external
timing signals. The rising edge of the start convert pulse initiates a conversion.
2. A start convert pulse of 50ns is recommended when sampling at 10MHz.
3. The falling edge of the subsequent start convert pulse (N+1) or the rising
edge of the N+2 pulse can be used to latch data from conversion N (1
pipeline delay).
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
Digital Output Code
This histogram represents the typical peak-to-peak
noise (including quantization noise) associated with
the ADS-945. 16,384 conversions were processed with
the input to the ADS-945 tied to analog ground.
Figure 5. ADS-945 FFT Analysis
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
Figure 6. ADS-945 Grounded Input Histogram
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
21 Aug 2015
MDA_ADS-945.B03 Page 6 of 8
ADS-945
14-Bit, 10MHz Sampling A/D Converters
Figure 7. ADS-945 Histogram and Differential Nonlinearity
THD vs. Input Frequency
90
80
80
70
70
60
60
THD (–dB)
Peak Harmonic (–dB)
PH vs. Input Frequency
90
50
40
50
40
30
30
20
20
10
10
0
0
1
10
100
1000
10000
100000
1
10
100
Frequency (kHz)
10000
100000
10000
100000
SNR+D vs. Input Frequency
90
80
80
70
70
60
60
SNR+D (dB)
90
50
40
THD (–dB)
SNR (dB)
SNR vs. Input Frequency
Peak Harmonic (–dB)
1000
Frequency (kHz)
50
40
30
30
20
20
10
10
0
0
1
10
100
1000
10000
100000
1
10
100
Frequency (kHz)
1000
Frequency (kHz)
Figure 8. ADS-945 Dynamic Performance vs. Input Frequency at +25°C
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: [email protected]
21 Aug 2015
MDA_ADS-945.B03 Page 7 of 8
ADS-945
14-Bit, 10MHz Sampling A/D Converters
MECHANICAL DIMENSIONS INCHES (mm)
0.29 MAX.
(7.37)
1.80
(45.72)
0.15 MIN.
(3.81)
0.06 (1.52)
0.100 (2.54) TYP.
76
2.06 MAX.
(52.32)
1
3.700
(93.98)
4.02
(102.11)
MAX.
Missing pin 26
is for keying
purposes
4.06
(103.12)
MAX.
0.25 Square
(6.35) TYP.
39
38
Insulated surface with
internal ground plane
Metal case
2.02 MAX.
(51.31)
Epoxy glass
(FR-4) base
ORDERING INFORMATION
MODEL
NUMBER
ADS-945
ADS-945EX
ADS-945
ADS-945EX
OPERATING
TEMP. RANGE
PACKAGE
ROHS
0 to +70°C
TDIP
No
-55 to +125°C
TDIP
No
0 to +70°C
TDIP
No
-55 to +125°C
TDIP
No
DATEL is a registered trademark of DATEL, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
ACCESSORIES
ADS-B945
Evaluation Board (without ADS-945)
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]
21 Aug 2015
MDA_ADS-945.B03 Page 8 of 8