Analog Devices AD9057 d Datasheet

8-Bit 40 MSPS/60 MSPS/80 MSPS

a

FEATURES
8-Bit, Low Power ADC: 200 mW Typical
120 MHz Analog Bandwidth
On-Chip 2.5 V Reference and Track-and-Hold
1 V p-p Analog Input Range
Single 5 V Supply Operation
5 V or 3 V Logic Interface
Power-Down Mode: <10 mW
3 Performance Grades (40 MSPS, 60 MSPS, 80 MSPS)

APPLICATIONS
Digital Communications (QAM Demodulators)
RGB and YC/Composite Video Processing
Digital Data Storage Read Channels
Medical Imaging
Digital Instrumentation

PRODUCT DESCRIPTION

The AD9057 is an 8-bit monolithic analog-to-digital converter
optimized for low cost, low power, small size, and ease of use.
With 40 MSPS, 60 MSPS, or 80 MSPS encode rate capability
and full-power analog bandwidth of 120 MHz, the component is
ideal for applications requiring excellent dynamic performance.

To minimize system cost and power dissipation, the AD9057
includes an internal 2.5 V reference and a track-and-hold (T/H)
circuit. The user must provide only a 5 V power supply and an
encode clock. No external reference or driver components are
required for many applications.

The AD9057’s encode input is TTL/CMOS compatible, and the
8-bit digital outputs can be operated from 5 V or 3 V supplies. A

A/D Converter

AD9057

FUNCTIONAL BLOCK DIAGRAM

D

2.5V

GND

PWRDN V

AD9057

1k⍀

DD

ADCT/H

ENCODE

8

D7–D0

V

AIN

BIAS OUT

VREF IN

VREF OUT

power-down function may be exercised to bring total consumption
to <10 mW. In power-down mode, the digital outputs are driven
to a high impedance state.

Fabricated on an advanced BiCMOS process, the AD9057 is
available in a space-saving 20-lead shrink small outline package
(20-lead SSOP) and is specified over the industrial temperature
range (–40∞C to +85∞C).

Customers desiring multichannel digitization may consider the
AD9059, a dual 8-bit, 60 MSPS monolithic based on the
AD9057 ADC core. The AD9059 is available in a 28-lead sur­face-mount plastic package (28-lead SSOP) and is specified over
the industrial temperature range.

REV. D

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
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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: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

AD9057–SPECIFICATIONS

(VD = 5 V, VDD = 3 V; external reference, unless otherwise noted.)

Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Unit

Test AD9057BRS-40 AD9057BRS-60 AD9057BRS-80

RESOLUTION 8 8 8 Bits

DC ACCURACY

Differential Nonlinearity 25∞CI 0.75 1.9 0.75 1.9 0.75 1.9 LSB

Full VI 2.0 2.0 2.0 LSB

Integral Nonlinearity 25∞CI 0.75 1.9 0.75 1.9 0.75 1.9 LSB

Full VI 2.0 2.0 2.0 LSB
No Missing Codes Full VI Guaranteed Guaranteed Guaranteed
Gain Error

Gain Tempco

1

1

25∞CI –6 –2.5 +6 –6 –2.5 +6 –6 –2.5 +6 % FS

Full VI –8 +8 –8 +8 –8 +8 % FS

Full V ± 70 ± 70 ± 70 ppm/∞C

ANALOG INPUT

Input Voltage Range

(Centered at 2.5 V) 25∞CV 1.0 1.0 1.0 V p-p

Input Offset Voltage 25∞CI –15 0 +15 –15 0 +15 –15 0 +15 mV

Full VI –25 +25 –25 +25 –25 +25 mV
Input Resistance 25∞CV 150 150 150 kW
Input Capacitance 25∞CV 222pF
Input Bias Current 25∞CI 6 16 6 16 6 16 mA

Full VI 25 25 25 mA
Analog Bandwidth 25∞CV 120 120 120 MHz

BAND GAP REFERENCE

Output Voltage Full VI 2.4 2.5 2.6 2.4 2.5 2.6 2.4 2.5 2.6 V
Temperature Coefficient Full V ±10 ± 10 ± 10 ppm/∞C

SWITCHING PERFORMANCE

Maximum Conversion Rate Full VI 40 60 80 MSPS
Minimum Conversion Rate Full IV 5 5 5 MSPS
Aperture Delay (t
Aperture Uncertainty (Jitter) 25∞CV 555ps rms
Output Valid Time (t

)25∞CV 2.7 2.7 2.7 ns

A

2

)

V

Full IV 4.0 6.6 4.0 6.6 4.0 6.6 ns
Output Propagation Delay (tPD)2Full IV 11.5 18.0 9.5 14.2 8.0 11.3 ns

DYNAMIC PERFORMANCE

3

Transient Response 25∞CV 999ns
Overvoltage Recovery Time 25∞CV 999ns
Signal-to-Noise Ratio (SINAD)

(With Harmonics)

f

= 10.3 MHz 25∞CI 42 45.5 42 45 41.5 45 dB

IN

= 76 MHz 25∞CV 44.0 43.5 43.5 dB

f

IN

Effective Number of Bits (ENOB)

f

= 10.3 MHz 25∞CI 6.7 7.2 6.7 7.2 6.6 7.2 Bits

IN

= 76 MHz 25∞CV 7.0 6.9 6.9 Bits

f

IN

Signal-to-Noise Ratio (SNR)

(Without Harmonics)

f

= 10.3 MHz 25∞CI 43 46.5 43 46 42.5 46 dB

IN

f

= 76 MHz 25∞CV 45.5 45 45 dB

IN

Second Harmonic Distortion

= 10.3 MHz 25∞CI –50 –62 –50 –62 –50 –62 dBc

f

IN

f

= 76 MHz 25∞CV –54 –54 –54 dBc

IN

Third Harmonic Distortion

= 10.3 MHz 25∞CI –46 –60 –46 –60 –46 –60 dBc

f

IN

f

= 76 MHz 25∞CV –54 –54 –54 dBc

IN

Two Tone Intermodulation

Distortion (IMD) 25∞CV –52 –52 –52 dBc
Differential Phase 25∞CV 0.8 0.8 0.8 Degrees
Differential Gain 25∞CV 1.0 1.0 1.0 %

DIGITAL INPUTS

Logic 1 Voltage Full VI 2.0 2.0 2.0 V
Logic 0 Voltage Full VI 0.8 0.8 0.8 V
Logic 1 Current Full VI ±1 ±1 ± 1 mA
Logic 0 Current Full VI ±1 ±1 ± 1 mA
Input Capacitance 25∞CV 4.5 4.5 4.5 pF
Encode Pulsewidth High (t

)25∞CIV 9.0 166 6.7 166 5.5 166 ns

EH

Encode Pulsewidth Low (tEL)25∞CIV 9.0 166 6.7 166 5.5 166 ns

–2–

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AD9057

Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Unit

Test AD9057BRS-40 AD9057BRS-60 AD9057BRS-80

DIGITAL OUTPUTS

Logic 1 Voltage (V
Logic 1 Voltage (V

= 3 V) Full VI 2.95 2.95 2.95 V

DD

= 5 V) Full IV 4.95 4.95 4.95 V

DD

Logic 0 Voltage Full VI 0.05 0.05 0.05 V
Output Coding Offset Binary Code Offset Binary Code Offset Binary Code

POWER SUPPLY

Supply Current (VD = 5 V) Full VI 36 48 38 48 40 51 mA

V

D

Supply Current (VDD = 3 V)4Full VI 4.0 6.5 5.5 6.5 7.4 8.8 mA

V

DD

Power Dissipation

5, 6

Full VI 192 260 205 260 220 281 mW
Power-Down Dissipation Full VI 6 10 6 10 6 10 mW
Power Supply Rejection Ratio

(PSRR) 25∞CV 333mV/V

NOTES

1

Gain error and gain temperature coefficient are based on the ADC only (with a fixed 2.5 V external reference).

2

tV and tPD are measured from the 1.5 V level of the encode to the 10%/90% levels of the digital output swing. The digital output load during test is not to exceed

an ac load of 10 pF or a dc current of ± 40 mA.

3

SNR/harmonics based on an analog input voltage of –0.5 dBFS referenced to a 1.0 V full-scale input range.

4

Digital supply current based on VDD = 3 V output drive with <10 pF loading under dynamic test conditions.

5

Power dissipation is based on specified encode and 10.3 MHz analog input dynamic test conditions (VD = 5 V ± 5%, VDD = 3 V ± 5%).

6

Typical thermal impedance for the RS style (SSOP) 20-lead package: qJC = 46∞C/W, qCA = 80∞C/W, and qJA = 126∞C/W.

Specifications subject to change without notice.

EXPLANATION OF TEST LEVELS

Test Level Description

I 100% production tested.
II 100% production tested at 25∞C and sample

tested at specified temperatures.
III Sample tested only.
IV Parameter is guaranteed by design and charac-

terization testing.
VParameter is a typical value only.
VI 100% production tested at 25∞C; guaranteed

by design and characterization testing

for industrial temperature range.

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AIN

ENCODE

DIGITAL

OUTPUTS

N

N + 1

t

A

t

EH

N – 3 N – 2 N – 1 N N + 1 N + 2

t

APERTURE DELAY

A

t

PULSEWIDTH HIGH

EH

t

PULSEWIDTH LOW

EL

t

OUTPUT VALID TIME

V

t

OUTPUT PROP DELAY

PD

N + 2

t

EL

N + 3

N + 4

t

V

t

PD

MIN TYP MAX

2.7 ns

166 ns

4.0 ns

166 ns

6.6 ns

9.5 ns

Figure 1. Timing Diagram

–3–

N + 5

AD9057

ABSOLUTE MAXIMUM RATINGS*

VD, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

Analog Inputs . . . . . . . . . . . . . . . . . . . . –0.5 V to V

Digital Inputs . . . . . . . . . . . . . . . . . . . –0.5 V to V

+ 0.5 V

D

+ 0.5 V

DD

VREF Input . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VD + 0.5 V

Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Operating Temperature . . . . . . . . . . . . . . . . –55∞C to +125∞C

Storage Temperature . . . . . . . . . . . . . . . . . . –65∞C to +150∞C

Maximum Junction Temperature . . . . . . . . . . . . . . . . 150∞C

Maximum Case Temperature . . . . . . . . . . . . . . . . . . . 150∞C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

ORDERING GUIDE

Temperature

Model Range Package Option*

AD9057BRS-40 –40∞C to +85∞C RS-20
AD9057BRS-60 –40∞C to +85∞C RS-20
AD9057BRS-80 –40∞C to +85∞C RS-20
AD9057/PCB 25∞CEvaluation Board

*RS = Shrink Small Outline Package (SSOP).

Table I. Digital Coding (VREF = 2.5 V)

Analog Input Voltage Level Digital Output

3.0 V Positive Full Scale 1111 1111

2.502 V Midscale +1/2 LSB 1000 0000

2.498 V Midscale –1/2 LSB 0111 1111

2.0 V Negative Full Scale 0000 0000

PIN CONFIGURATION

PWRDN

VREF OUT

VREF IN

GND

V

BIAS OUT

AIN

V

GND

ENCODE

1

2

3

4

5

D

6

7

8

D

9

10

AD9057

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

D0 (LSB)

D1

D2

D3

GND

V

DD

D4

D5

D6

D7 (MSB)

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Function

1 PWRDN Power-Down Function Select;

Logic High for Power-Down
Mode (Digital Outputs Go to
High Impedance State).

2 VREF OUT Internal Reference Output

(2.5 V typ); Bypass with 0.1 mF
to Ground.

3 VREF IN Reference Input for ADC (2.5 V

typ, ± 10%).

4, 9, 16 GND Ground (Analog/Digital).

5, 8 V

D

Analog 5 V Power Supply.

6 BIAS OUT Bias Pin for AC Coupling

(1 kW to REF IN).

7 AIN Analog Input for ADC.

10 ENCODE Encode Clock for ADC (ADC

Samples on Rising Edge of
Encode).

11–14, 17–20 D7–D0 Digital Outputs of ADC.

15 V

DD

Digital Output Power Supply;
Nominally 3 V to 5

V.

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 AD9057 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.

–4–

WARNING!

ESD SENSITIVE DEVICE

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