ADC-B119 [ETC]
12-Bit, 10MHz, Low-Power Sampling A/D Converters; 12位， 10MHz的，低功耗采样A / D转换器
| 型号： | ADC-B119 |
| 厂家： | 
ETC |
| 描述： | 12-Bit, 10MHz, Low-Power Sampling A/D Converters |
| 文件： | 总8页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
®
ADS -1 1 9
12-Bit, 10MHz, Low-Power
Sampling A/D Converters
FEATURES
• 12-bit resolution
• 10MHz minimum sampling rate
• Functionally complete
• Small 24-pin DDIP or SMT package
• Requires only ±5V supplies
• Low-power, 1.8 Watts
• Outstanding dynamic performance
• Edge-triggered
• No missing codes over temperature
• Ideal for both time and frequency-domain applications
INPUT/OUTPUT CONNECTIONS
GENERAL DESCRIPTION
PIN
FUNCTION
PIN
FUNCTION
The ADS-119 is a high-performance, 12-bit, 10MHz sampling
A/D converter. The device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-119 features
excellent dynamic performance including a typical SNR of
69dB.
1
2
BIT 12 (LSB)
BIT 11
BIT 10
BIT 9
24
23
22
21
20
19
18
17
16
15
14
13
NO CONNECT
ANALOG GROUND
NO CONNECT
3
4
+5V ANALOG SUPPLY
–5V SUPPLY
5
BIT 8
Packaged in a metal-sealed, ceramic, 24-pin DDIP, the
functionally complete ADS-119 contains a fast-settling sample/
hold amplifier, a subranging (two-pass) A/D converter, a
precise voltage reference, timing/control logic, and error-
correction circuitry. All timing and control logic operates from
the rising edge of a single start convert pulse. Digital input and
output levels are TTL.
6
BIT 7
ANALOG INPUT
ANALOG GROUND
OFFSET ADJUST
START CONVERT
DATA VALID
7
8
BIT 6
BIT 5
9
BIT 4
10
11
12
BIT 3
BIT 2
DIGITAL GROUND
+5V DIGITAL SUPPLY
BIT 1
Requiring only ±5V supplies, the ADS-119 typically dissipates
1.8 Watts. The unit offers a bipolar input range of ±1.5V.
Models are available for use in either commercial (0 to +70°C)
or military (–55 to +125°C) operating temperature ranges.
Typical applications include signal analysis, medical/graphic
imaging, process control, ATE, radar, and sonar.
OFFSET ADJUST 17
BUFFER
ANALOG INPUT 19
–
+
12 BIT 1 (MSB)
11 BIT 2
S/H
FLASH
ADC
1
10 BIT 3
9
8
7
6
5
4
3
2
1
BIT 4
BIT 5
REF
BIT 6
DAC
BIT 7
Σ
BIT 9
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
FLASH
ADC
2
AMP
START CONVERT 16
DATA VALID 15
TIMING AND
CONTROL LOGIC
21
13
14
20
18, 23
22, 24
+5V ANALOG
SUPPLY
+5V DIGITAL
SUPPLY
DIGITAL
GROUND
–5V SUPPLY
ANALOG
GROUND
NO CONNECT
Figure 1. ADS-119 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance: (800) 233-2765
®
®
ADS -1 1 9
ABSOLUTE MAXIMUM RATINGS
PHYSICAL/ENVIRONMENTAL
PARAMETERS
LIMITS
UNITS
PARAMETERS
MIN.
TYP.
MAX.
UNITS
+5V Supply (Pin 13, 21)
–5V Supply (Pin 20)
Digital Input (Pin 16)
Analog Input (Pin 19)
Lead Temp (10 seconds)
0 to +6
0 to –6
–0.3 to +VDD +0.3
±5
Volts
Volts
Volts
Volts
°C
Operating Temp. Range, Case
ADS-119MC/GC
ADS-119MM/GM/883
Thermal Impedance
θjc
0
–55
—
—
+70
+125
°C
°C
6
24
°C/Watt
°C/Watt
+300
θca
Storage Temperature
Package Type
Weight
–65
—
+150
°C
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VDD = ±5V, 10mHz sampling rate, and a minimum
3 minute warmup ➀unless otherwise specified.)
24-pin, metal-sealed, ceramic DDIP or SMIT
0.42 ounces (12 grams)
+25°C
0 to +70°C
–55 to +125°C
ANALOG INPUT
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
UNITS
Input Voltage Range ➁
Input Resistance
Input Capacitance
—
300
—
±1.5
350
6
—
—
15
—
300
—
±1.5
350
6
—
—
15
—
300
—
±1.5
350
6
—
—
15
Volts
Ω
pF
DIGITAL INPUT
Logic Levels
Logic "1"
Logic "0"
+2.0
—
—
—
—
—
—
—
—
50
—
+0.8
+20
–20
—
+2.0
—
—
—
—
—
—
—
—
50
—
+0.8
+20
–20
—
+2.0
—
—
—
—
—
—
—
—
50
—
+0.8
+20
–20
—
Volts
Volts
µA
µA
ns
Logic Loading "1"
Logic Loading "0"
Start Convert Positive Pulse Width ➂
STATIC PERFORMANCE
Resolution
—
—
—
—
—
—
—
12
12
±0.75
±0.5
±0.2
±0.2
±0.1
±0.1
—
—
—
—
—
0.95
—
—
—
—
12
12
—
—
+1
±0.75
±0.7
±0.7
±1.0
—
—
—
–0.95
—
—
—
—
12
12
±1.5
±0.75
±0.75
±0.6
±0.7
±1.0
—
—
—
Bits
LSB
LSB
Integral Nonlinearity (fin = 10kHz)
Differential Nonlinearity (fin = 10kHz)
Full Scale Absolute Accuracy
Bipolar Zero Error (Tech Note 2)
Unipolar Offset Error (Tech Note 2)
Gain Error (Tech Note 2)
±1.0
±0.5
±0.5
±0.3
±0.3
±0.5
—
±0.95
±0.5
±0.6
±0.6
±0.5
—
+1.25
±1.5
±1.0
±1.5
±2.5
—
%FSR
%FSR
%
Bits
No Missing Codes (fin = 10kHz)
DYNAMIC PERFORMANCE
Peak Harmonics (–0.5dB)
dc to 1MHz
1MHz to 2.5MHz
—
—
—
–70
–70
–70
–63
–63
–63
—
—
—
–70
–70
–70
–63
–63
–63
—
—
—
–69
–69
–67
–61
–60
–60
dB
dB
dB
2.5MHz to 5MHz
Total Harmonic Distortion (–0.5dB)
dc to 1MHz
1MHz to 2.5MHz
2.5MHz to 5MHz
—
—
—
–69
–68
–68
–63
–63
–63
—
—
—
–69
–68
–67
–63
–63
–63
—
—
—
–68
–67
–66
–60
–60
–60
dB
dB
Signal-to-Noise Ratio
(w/o distortion, –0.5dB)
dc to 1MHz
1MHz to 2.5MHz
2.5MHz to 5MHz
66
66
66
69
69
69
—
—
—
66
66
66
69
69
69
—
—
—
63
63
63
67
66
66
—
—
—
dB
dB
dB
Signal-to-Noise Ratio ➃
(& distortion, –0.5dB)
dc to 1MHz
1MHz to 2.5MHz
2.5MHz to 5MHz
62
62
62
66
66
66
—
—
—
62
62
62
66
66
66
—
—
—
60
60
60
65
65
64
—
—
—
dB
dB
dB
Two-tone Intermodulation
Distortion (fin = 100kHz,
240kHz, fs = 1MHz, –0.5dB)
Noise
—
—
–72
250
—
—
—
—
–72
300
—
—
—
—
–72
400
—
—
dB
µVrms
Input Bandwidth (–3dB)
Small Signal (–20dB input)
Large Signal (–0dB input)
Feedthrough Rejection (fin = 5MHz)
Slew Rate
Aperture Delay Time
Aperture Uncertainty
S/HAquisitionTime
(to ±0.01%FSR, 3V step)
Overvoltage Recovery Time ➄
A/D Conversion Rate
—
—
—
—
—
—
60
10
76
±400
5
—
—
—
—
—
—
—
—
—
—
—
—
60
10
76
±400
5
—
—
—
—
—
—
—
—
—
—
—
—
60
10
76
±400
5
—
—
—
—
—
—
MHz
MHz
dB
V/µs
ns
3
3
3
ps rms
30
—
10
35
100
—
37
—
—
30
—
500
35
100
—
37
—
—
30
—
500
35
100
—
37
—
—
ns
ns
MHz
2
®
®
ADS -1 1 9
+25°C
TYP.
0 to +70°C
TYP.
–55 to +125°C
TYP.
DIGITAL OUTPUTS
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
UNITS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
+2.4
—
—
—
—
—
—
—
+0.4
–4
+2.4
—
—
—
—
—
—
—
+0.4
–4
+2.4
—
—
—
—
—
—
—
+0.4
–4
Volts
Volts
mA
—
+4
—
+4
—
+4
mA
Output Coding
Offset Binary
POWER REQUIREMENTS
Power Supply Ranges ➅
+5V Supply
–5V Supply
+4.75
–4.75
+5.0
–5.0
+5.25
–5.25
+4.75
–4.75
+5.0
–5.0
+5.25
–5.25
+4.9
–4.9
+5.0
–5.0
+5.25
–5.25
Volts
Volts
Power Supply Current
+5V Supply
–5V Supply
Power Dissipation
Power Supply Rejection
—
—
—
—
+200
–180
1.8
+215
–205
2.1
—
—
—
—
+200
–180
1.8
+215
–205
2.1
—
—
—
—
+200
–180
1.8
+215
–205
2.1
mA
mA
Watts
—
±0.01
—
±0.01
—
±0.01
%FSR/%V
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. There is slight
degradation in performance when using ±12V supplies.
➃ Effective bits is equal to:
Full Scale Amplitude
Actual Input Amplitude
(SNR + Distortion) – 1.76 + 20 log
6.02
➁ See ordering information for availability of ±5V input range. Contact DATEL for
➄ This is the time required before the A/D output data is valid after the analog input
is back within the specified range.
availability of other input voltage ranges.
➂ A 200ns wide start convert pulse is used for all production testing. Only the rising
edge of the start convert pulse is required for the device to operate
(edge-triggered).
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-119
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, 18, and 23) directly to
a large analog ground plane beneath the package.
initial offset and gain errors can be reduced to zero using
the adjustment circuitry shown in Figures 3 and 4. For
operation without adjustment, tie pin 17 to analog ground.
When using this circuitry, or any similar offset and gain-
calibration hardware, make adjustments following warmup.
To avoid interaction, always adjust offset before gain.
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.
3. Applying a start convert pulse while a conversion is in
progress (EOC = logic "1") will initiate a new and inaccurate
conversion cycle.
2. The ADS-119 achieves its specified accuracies without the
need for external calibration. If required, the device's small
4. Data is valid only for the time period (55ns, typical) shown in
Figure 2 even if the device is sampling at less than 10MHz.
N
N+1
START
CONVERT
50ns typ.
10ns typ.
Acquisition Time
INTERNAL S/H
INTERNAL EOC
Hold
Hold
30ns min.
35ns typ.
37ns max.
65ns typ.
15ns typ.
20ns typ.
Conversion Time
72ns min.
80ns typ.
83ns max.
35ns typ.
DATA
VALID
60ns typ.
40ns typ.
±5ns
40ns typ.
±5ns
10ns typ.
DATA N-1 VALID
55ns typ.
45ns typ.
DATA
DATA N VALID
INVALID DATA
INVALID DATA
INVALID DATA
Scale is approximately 5ns per division.
Figure 2. ADS-119 Timing Diagram
3
®
®
ADS -1 1 9
CALIBRATION PROCEDURE
(Refer to Figures 3 and 4, Table 1)
Gain Adjust Procedure
1. Apply +1.4989V to the ANALOG INPUT (pin 19).
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 Figure 3 and 4 are guaranteed to
compensate for the ADS-119's initial accuracy errors and may
not be able to compensate for additional system errors.
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 1.
Table 1. Output Coding for Bipolar Operation
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.
BIPOLAR
SCALE
ADS-119
INPUT VOLTAGE
(±1.5V RANGE)
OUTPUT CODING
OFFSET BINARY
MSB
LSB
+FS–1 LSB
+3/4 FS
+1/2 FS
0
–1/2 FS
–3/4 FS
–FS +1 LSB
–FS
+1.49927V
+1.12500V
+0.75000V
0.00000V
–0.75000V
–1.12500V
–1.49927V
–1.50000V
1111 1111 1111
1110 0000 0000
1100 0000 0000
1000 0000 0000
0100 0000 0000
0010 0000 0000
0000 0000 0001
0000 0000 0000
Offset adjusting for the ADS-119 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 (+366µV).
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 1 ½ LSB's
(+1.4989V).
2kΩ
GAIN
ADJUST
+15V
Zero/Offset Adjust Procedure
1.98kΩ
SIGNAL
INPUT
1. Apply a train of pulses to the START CONVERT input
(pin 16) so the converter is continuously converting.
To Pin 19
of ADS-119
50Ω
2. Apply +366µV to the ANALOG INPUT (pin 19).
–15V
3. Adjust the offset potentiometer until the output bits are
1000 0000 0000 and the LSB flickers between 0 and 1.
Figure 3. Optional Calibration Circuit, ADS-119
12 BIT 1 (MSB)
➀
+5V
13, 20
14
BIT 2
11
10 BIT 3
4.7µF
4.7µF
0.1µF
9
8
7
6
5
4
3
2
1
BIT 4
BIT 5
BIT 6
BIT 7
20
–5V
BIT 8
ADS-119
0.1µF
+5V
BIT 9
18, 20
BIT 10
BIT 11
BIT 12 (LSB)
15 DATA VALID
OFFSET
ADJUST
17
ANALOG INPUT
19
16 START CONVERT
20kΩ
–5V
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.
➀
Figure 4. Typical Connection Diagram
4
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®
ADS -1 1 9
5
®
®
ADS -1 1 9
THERMAL REQUIREMENTS
3000
2500
2000
1500
1000
500
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 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. 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.
In more severe ambient conditions, the package/junction
temperature of a given device can be reduced dramatically
(typically 35%) by using one of DATEL's HS Series heat sinks.
See Ordering Information for the assigned part number. See
page 1-183 of the DATEL Data Acquisition Components
Catalog for more information on the HS Series. Request
DATEL Application Note AN-8, "Heat Sinks for DIP Data
Converters", or contact DATEL directly, for additional
information.
0
Digital Output Code
Figure 6. ADS-119 Grounded Input Histogram
This histogram represents the typical peak-to-peak noise
(including quantization noise) associated with the ADS-119.
4,096 conversions were processed with the input to the
ADS-119 tied to analog ground.
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Frequency (MHz)
(fs = 10MHz, fin = 4.9MHz, Vin = –0.5dB, 4,096-point FFT)
Figure 7. ADS-119 FFT Analysis
6
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®
ADS -1 1 9
+0.73
0
–0.47
0
4096
Digital Output Code
0
4096
Digital Output Code
Figure 8. ADS-119 Histogram and Differential Nonlinearity
PH vs. Input Frequency
THD vs. Input Frequency
80
80
70
60
50
40
30
20
10
0
70
60
50
40
30
20
10
0
1
10
100
1000
10000
1
10
100
1000
10000
Frequency (kHz)
Frequency (kHz)
SNR vs. Input Frequency
SNR+D vs. Input Frequency
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
1
10
100
1000
10000
1
10
100
1000
10000
Frequency (kHz)
Frequency (kHz)
Figure 9. ADS-119 Performance Curves
7
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®
ADS -1 1 9
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX.
(33.27)
24-Pin DDIP
Version
Dimension Tolerances
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
(unless otherwise indicated):
24
1
13
12
Lead Material: Kovar alloy
0.80 MAX.
(20.32)
ADS-119MC
ADS-119MM
ADS-926MC
ADS-119/883
Lead Finish:
50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
0.100 TYP.
(2.540)
1.100
(27.940)
0.235 MAX.
(5.969)
PIN 1 INDEX
0.200 MAX.
(5.080)
+0.002
–0.001
0.010
(0.254)
0.190 MAX.
(4.826)
0.100
(2.540)
0.100
(2.540)
0.600 ±0.010
SEATING
(15.240)
PLANE
0.025
(0.635)
0.040
(1.016)
0.018 ±0.002
(0.457)
1.31 MAX.
(33.02)
24-Pin
Surface Mount
Versions
(unless otherwise indicated):
Dimension Tolerances
13
12
24
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
ADS-119GC
ADS-119GM
ateria
l:
Kovar alloy
Lead M
0.80 MAX.
(20.32)
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
1
0.020 TYP.
(0.508)
0.060 TYP.
0.015
(1.524)
(0.381)
0.210 MAX.
(5.334)
MAX. radius
for any pin
0.130 TYP.
(3.302)
PIN 1
INDEX
0.100
(2.540)
0.020
(0.508)
0.010 TYP.
(0.254)
0.100 TYP.
(2.540)
0.040
(1.016)
ORDERING INFORMATION
ACCESSORIES
MODEL NUMBER
OPERATING TEMP. RANGE
ADS-B119
HS-24
Evaluation Board (without ADS-119)
ADS-119MC
ADS-119MM
ADS-119/883
ADS-119GC
ADS-119GM
0 to +70°C
–55 to +125°C
–55 to +125°C
0 to +70°C
Heat Sinks for all ADS-119 DDIP models
–55 to +125°C
Receptacles for PC board mounting can be ordered through AMP Inc. Part # 3-331272-8 (Components Lead Socket), 24 required.
For MIL-STD-883 product specification or availability of surface mounts package, contact DATEL.
®
®
ISO 9001
DS-0289B
3/97
R
E
G
I
S
T
E
R
E
D
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com E-mail:sales@datel.com
Data Sheet Fax Back: (508) 261-2857
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark.
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MINI
ADC-ED11372/1
Directional Coupler, 5MHz Min, 1500MHz Max, 2.6dB Insertion Loss-Max, PLASTIC, CASE CD542, 6 PIN
MINI
ADC-ED11372/1+
Directional Coupler, 5MHz Min, 1500MHz Max, 2.6dB Insertion Loss-Max, PLASTIC, CASE CD542, 6 PIN
MINI
ADC-ED8270/1
Directional Coupler, 200MHz Min, 1800MHz Max, 2.75dB Insertion Loss-Max, PLASTIC, CASE CD542, 6 PIN
MINI
ADC-ED8270/1+
Directional Coupler, 200MHz Min, 1800MHz Max, 2.75dB Insertion Loss-Max, PLASTIC, CASE CD542, 6 PIN
MINI
ADC-ED9780/1+
Directional Coupler, 0.5MHz Min, 2000MHz Max, 4.56dB Insertion Loss-Max, PLASTIC, CASE CD637, 6 PIN
MINI
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