Analog Devices AD9040A d Datasheet
10-Bit 40 MSPS
A/D Converter
AD9040A
FEATURES
Low Power: 940 mW
53 dB SNR @ 10 MHz A
IN
On-Chip Track-and-Hold, Reference
CMOS Compatible
2 V p-p Analog Input
Fully Characterized Dynamic Performance
APPLICATIONS
Ultrasound Medical Imaging
Digital Oscilloscopes
Professional Video
Digital Communications
Advanced Television (MUSE Decoders)
Instrumentation
GENERAL DESCRIPTION
The AD9040A is a complete 10-bit monolithic sampling analogto-digital converter (ADC) with on-board track-and-hold (T/H)
and reference. The unit is designed for low cost, high performance applications and requires only an encode signal to achieve
40 MSPS sample rates with 10-bit resolution.
Digital inputs and outputs are CMOS compatible; the analog
input requires a signal of 2 V p-p amplitude. The two-step
architecture used in the AD9040A is optimized to provide the
best dynamic performance available while maintaining low
power requirements of only 940 mW typically; maximum dissipation is 1.1 W at 40 MSPS.
The signal-to-noise ratio (SNR), including harmonics, is 53 dB,
or 8.5 ENOB, when sampling an analog input of 10.3 MHz at
40 MSPS. Competitive devices perform at less than 7.5 ENOB
and require external references and larger input signals.
The AD9040A A/D converter is available in either a 28-lead
PDIP or a 28-lead SOIC package. The two models operate over
a commercial temperature range of 0°C to 70°C. Contact the
factory regarding availability of ceramic military temperature
range devices.
FUNCTIONAL BLOCK DIAGRAM
ENCODE
AMP
ARRAY
ERROR
CORRECTION
6-BIT
ADC
DECODE
LOGIC
10
GND
BP
A
IN
V
OUT
V
REF
REF
T/H T/H T/H
BAND GAP
REFERENCE
REF
AMP
AD9040A
5-BIT
ADC
DECODE
LOGIC
PRODUCT HIGHLIGHTS
1. CMOS compatible logic for direct interface to ASICs.
2. On-board track-and-hold provides excellent high frequency
performance on analog inputs, critical for communications
and medical imaging applications.
3. High input impedance and 2 V p-p input range reduce need
for external amplifiers.
4. Easy to use; no cumbersome external voltage references
required, allowing denser packing of ADCs for multichannel
applications.
5. Available in 28-lead PDIP and SOIC packages.
6. Evaluation board includes AD9040AJR, reconstruction DAC,
and latches. Space is available near the analog input and digital
outputs of the converter for additional circuits. Order as part
number AD9040A/PCB (schematic shown in data sheet).
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
(+VS = VD = +5 V; –VS = –5 V; internal reference: Encode = 40.5 MSPS, unless
AD9040A–SPECIFICATIONS
otherwise noted.)
Test AD9040AJN/AD9040AJR
Parameter (Conditions) Temp Level Min Typ Max Unit
RESOLUTION 10 Bits
DC ACCURACY
Differential Nonlinearity 25°CI 1.0 2.0 LSB
Full VI 2.5 LSB
Integral Nonlinearity 25°CI 1.0 2.25 LSB
Full VI 2.5 LSB
No Missing Codes Full VI Guaranteed
Gain Error 25°CI ± 0.5 ± 1.5 % FS
Gain Temperature Coefficient
1
Full VI ± 2% FS
Full V ± 70 ppm/°C
ANALOG INPUT
Input Voltage Range 25°CV 2 V p-p
Input Offset Voltage 25°CI ± 2 ± 25 mV
Full VI ± 30 mV
Input Bias Current 25°CI 7 15 µA
Full VI 25 µA
Input Resistance 25°CI 200 350 kΩ
Input Capacitance 25°CV 5 pF
Analog Bandwidth 25°CV 48 MHz
BAND GAP REFERENCE
Output Voltage Full VI 2.4 2.6 V
Temperature Coefficient
1
Full V ± 40 ppm/°C
SWITCHING PERFORMANCE
Maximum Conversion Rate 25°CI 40 MSPS
Minimum Conversion Rate 25°CIV210 MSPS
Aperture Delay (t
Aperture Uncertainty (Jitter) 25°CV 7 ps, rms
Output Propagation Delay (t
)25°CV 1.9 ns
A
2
PD
)
25°CI 7.5 10 12 ns
Full IV 6 14 ns
DYNAMIC PERFORMANCE
3
Transient Response 25°CV 25 ns
Overvoltage Recovery Time 25°CV 40 ns
Signal-to-Noise Ratio
4
fIN = 2.3 MHz 25°CI 4854 dB
= 10.3 MHz 25°CI 4753 dB
f
IN
Signal-to-Noise Ratio
4
(Without Harmonics)
= 2.3 MHz 25°CI 4955 dB
f
IN
f
= 10.3 MHz 25°CI 4854 dB
IN
Signal-to-Noise Ratio
4, 5
fIN = 2.3 MHz 25°CI 56 dB
f
= 10.3 MHz 25°CI 55 dB
IN
Signal-to-Noise Ratio
4, 5
(Without Harmonics)
f
= 2.3 MHz 25°CI 57 dB
IN
= 10.3 MHz 25°CI 56 dB
f
IN
Second Harmonic Distortion
= 2.3 MHz 25°CI 5667 dBc
f
IN
= 10.3 MHz 25°CI 5665 dBc
f
IN
Third Harmonic Distortion
= 2.3 MHz 25°CI 5773 dBc
f
IN
= 10.3 MHz 25°CI 5770 dBc
f
IN
Two-Tone Intermodulation
6
25°CV 62 dBc
Distortion Rejections
Differential Phase 25°C III 0.15 0.5 Degrees
Differential Gain 25°C III 0.25 1.0 %
REV. D–2–
AD9040A
Test AD9040AJN/AD9040AJR
Parameter (Conditions) Temp Level Min Typ Max Unit
ENCODE INPUT
Logic 1 Voltage Full VI 4.0 V
Logic 0 Voltage Full VI 1.0 V
Logic 1 Current Full VI ± 1 µA
Logic 0 Current Full VI ± 1 µA
Input Capacitance 25°CV 14 pF
Encode Pulsewidth (High) (t
Encode Pulsewidth (Low) (tEL)
DIGITAL OUTPUTS
Logic 1 Voltage Full VI 4.95 V
Logic 0 Voltage Full VI 0.05 V
Output Coding Offset Binary
POWER SUPPLY
Supply Current Full VI 13 20 mA
V
D
+VS Supply Current Full VI 89 110 mA
–V
Supply Current Full VI 87 105 mA
S
Power Dissipation Full VI 0.94 1.2 W
Power Supply Rejection Ratio (PSRR)825°CI ± 15 mV/V
NOTES
1
Gain temperature coefficient is for a converter using internal reference; temperature coefficient is for band gap reference only.
2
Output propagation delay (tPD) is measured from the 50% point of the falling edge of the encode command to the min/max voltage levels of the digital outputs with
10 pF maximum loads.
3
Minimum values apply to AD9040AJR only.
4
RMS signal to rms noise with analog input signal 1 dB below full scale at specified frequency.
5
Encode = 32 MSPS.
6
Third order intermodulation measured with analog input frequencies of 2.3 MHz and 2.4 MHz at 7 dB below full scale.
7
For rated performance at 40 MSPS, duty cycle of encode command should be 50% ±10%.
8
Measured as the ratio of the change in offset voltage for a 5% change in +VS or –VS.
Specifications subject to change without notice.
EH
7
)
7
25°CIV 10 100 ns
25°CIV 10 100 ns
EXPLANATION OF TEST LEVELS
Test Level
I 100% production tested.
II 100% production tested at 25°C and sample tested at speci-
fied temperatures. AC testing done on sample basis.
III Sample tested only.
IV Parameter is guaranteed by design and characterization
testing.
VParameter is a typical value only.
VI All devices are 100% production tested at 25°C. 100%
production tested at temperature extremes for military tem-
perature devices; guaranteed by design and characterization
testing for industrial devices.
REV. D
–3–
AD9040A
ABSOLUTE MAXIMUM RATINGS
± VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
V
D
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . –V
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to +V
V
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to +V
REF
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating Temperature
AD9040AJN/AD9040AJR . . . . . . . . . . . . . . . . . 0°C to 70°C
1
Maximum Junction Temperature2 (JN/JR Suffixes) . . . . 150°C
Lead Soldering Temp (10 sec) . . . . . . . . . . . . . . . . . . . . 300°C
NOTES
to +V
S
1
Absolute maximum ratings are limiting values to be applied individually and
S
beyond which the serviceability of the circuit may be impaired. Functional
S
operability is not necessarily implied. Exposure to absolute maximum rating
S
conditions for an extended period of time may affect device reliability.
2
Typical thermal impedances (parts soldered to board):
N Package (PDIP): JA = 42°C/W; JC = 10°C/W.
R Package (SOIC): JA = 47°C/W; JC = 10°C/W.
Storage Temperature . . . . . . . . . . . . . . . . . –65°C to +150°C
ORDERING GUIDE
Model Temperature Range Package Description Package Option
AD9040AJN 0°C to 70°C 28-Lead PDIP N-28
AD9040AJR 0°C to 70°C 28-Lead SOIC Package R-28
AD9040AJR-REEL 0°C to 70°C 28-Lead SOIC Package R-28
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD9040A features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
A
ENCODE
DIGITAL
OUTPUTS
N
tEHt
t
A
t
N + 1
NO. 2 NO. 3
EL
PD
DESCRIPTIONSYMBOL
APERTURE DELAY
t
A
t
PULSEWIDTH HIGH
EH
t
PULSEWIDTH LOW
EL
OUTPUT PROP DELAY
t
PD
N – 1N – 2N – 3
MIN TYP MAX
1.9ns
10ns
10ns 100ns
7.5ns
10ns
100ns
12ns
IN
Figure 1. Timing Diagram
REV. D–4–
PIN CONFIGURATION
)
PDIP and SOIC
–V
GND
+V
GND
V
OUT
V
REF
BP
REF
NC
ENCODE
+V
GND
–V
A
GND
1
S
2
3
S
4
5
6
AD9040A
7
TOP VIEW
(Not to Scale)
8
9
10
S
11
12
S
13
IN
14
NC = NO CONNECT
28
27
26
25
24
23
22
21
20
19
18
17
16
15
D0 (LSB)
D1
D2
D3
D4
V
GND
–V
D5
D6
D7
D8
D9 (MSB
OR
AD9040A
S
IN
GND
D8
D7
D6
D5
–V
D
S
DGND
+V
S
D
D4
D3
D2
D1
OR
D9 (MSB)
S
–V
D0 (LSB)
GND
DIE LAYOUT AND MECHANICAL INFORMATION
Die Dimensions . . . . . . . . . 204 mils × 185 mils × 21 (± 1) mils
Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 4 mils × 4 mils
Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum
Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –V
Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,070
Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride
Die Attach (JN/JR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Epoxy
Bond Wire (JN/JR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold
–V
A
GND
S
+V
NC = NO CONNECT
+V
S
ENCODE
NC
BP
REF
V
REF
V
OUT
GND
S
PIN FUNCTION DESCRIPTIONS
Pin No. Mnemonic Function
1, 12, 21 –V
S
5 V Power Supply.
2, 4, 11, 14, 22 GND Ground.
3, 10 +V
5V
6V
7BP
S
OUT
REF
REF
Analog 5 V Power Supply.
Internal Band Gap Voltage Reference (Nominally 2.5 V).
Noninverting Input to Reference Amplifier. Voltage reference for ADC is connected here.
External Connection for (0.1 µF) Reference Bypass Capacitor.
8NCNo Connection Internally.
9 ENCODE Encode Clock Input to ADC. Internal track-and-hold placed in hold mode (ADC is encoding)
on rising edge.
13 A
IN
Noninverting Input to Track-and-Hold Amplifier.
15 OR Out-of-Range Condition Output. Active high when analog input exceeds input range of ADC by
1 LSB (< F
– 1 LSB or > +FS + 1 LSB).
S
16 D9 (MSB) Most Significant Bit of ADC Output; TTL/CMOS Compatible.
17–20 D8–D5 Digital Output Bits of ADC; TTL/CMOS Compatible.
23 V
D
Digital +5 V Power Supply.
24–27 D4–D1 Digital Output Bits of ADC; TTL/CMOS Compatible.
28 D0 (LSB) Least Significant Bit of ADC Output; TTL/CMOS Compatible.
REV. D
–5–
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