Analog Devices AD9057 Datasheet

8-Bit

a

40 MSPS/60 MSPS/80 MSPS A/D Converter

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

APPLICATIONS
Digital Communications (QAM Demodulators)
RGB & 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 a 40 MSPS, 60 MSPS or 80 MSPS encode rates 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
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 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 surface mount plastic pack­age (20 SSOP) and is specified over the industrial (–40°C to
+85°C) temperature range.

AD9057

FUNCTIONAL BLOCK DIAGRAM

V

AIN

BIAS OUT

VREF IN

VREF OUT

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 SSOP) and is specified over the
industrial temperature range.

PIN CONFIGURATION

PWRDN

VREF OUT

VREF IN

BIAS OUT

ENCODE

D

+2.5V

GND

V

AIN

V

GND

AD9057

1kΩ

GND

1
2
3
4
5

D

6
7
8

D

9

10

(Not to Scale)

PWRDN V

ADCT/H

ENCODE

AD9057

TOP VIEW

20
19
18
17
16
15
14
13
12
11

DD

D0 (LSB)
D1
D2
D3
GND
V

DD

D4
D5
D6
D7 (MSB)

8

D7–D0

REV. B

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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1997

AD9057–SPECIFICA TIONS

(VD = +5 V, VDD = +3 V; external reference)

Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Units

Test AD9057BRS-40 AD9057BRS-60 AD9057BRS-80

RESOLUTION 8 8 8 Bits
DC ACCURACY

Differential Nonlinearity +25°C I 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°C I 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°C I –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°C V 1.0 1.0 1.0 V p-p

Input Offset Voltage +25°C I –15 ±0 +15 –15 ±0 +15 –15 ±0 +15 mV

Full VI –25 +25 –25 +25 –25 +25 mV
Input Resistance +25°C V 150 150 150 kΩ
Input Capacitance +25°CV222pF
Input Bias Current +25°CI 616 616 616µA

Full VI 25 25 25 µA
Analog Bandwidth +25°C V 120 120 120 MHz

BANDGAP 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°C V 5 5 5 ps, rms
Output Valid Time (t

) +25°C V 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°CV999ns
Overvoltage Recovery Time +25°CV999ns
Signal-to-Noise Ratio (SINAD)

(With Harmonics)

= 10.3 MHz +25°C I 42 45.5 42 45 41.5 45 dB

f

IN

= 76 MHz +25°C V 44.0 43.5 43.5 dB

f

IN

Effective Number of Bits

= 10.3 MHz +25°C I 6.7 7.2 6.7 7.2 6.6 7.2 Bits

f

IN

= 76 MHz +25°C V 7.0 6.9 6.9 Bits

f

IN

Signal-to-Noise Ratio (SNR)

(Without Harmonics)

= 10.3 MHz +25°C I 43 46.5 43 46 42.5 46 dB

f

IN

= 76 MHz +25°C V 45.5 45 45 dB

f

IN

2nd Harmonic Distortion

= 10.3 MHz +25°C I –50 –62 –50 –62 –50 –62 dBc

f

IN

= 76 MHz +25°C V –54 –54 –54 dBc

f

IN

3rd Harmonic Distortion

= 10.3 MHz +25°C I –46 –60 –46 –60 –46 –60 dBc

f

IN

= 76 MHz +25°C V –54 –54 –54 dBc

f

IN

Two Tone Intermodulation

Distortion (IMD) +25°C V –52 –52 –52 dBc
Differential Phase +25°C V 0.8 0.8 0.8 Degrees
Differential Gain +25°C V 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 µA
Logic “0” Current Full VI ±1 ±1 ±1 µA
Input Capacitance +25°C V 4.5 4.5 4.5 pF
Encode Pulse Width High (t

) +25°C IV 9.0 166 6.7 166 5.5 166 ns

EH

Encode Pulse Width Low (tEL) +25°C IV 9.0 166 6.7 166 5.5 166 ns

–2–

REV. B

AD9057

Parameter Temp Level Min Typ Max Min Typ Max Min Typ Max Units

Test AD9057BRS-40 AD9057BRS-60 AD9057BRS-80

DIGITAL OUTPUTS

Logic “1” Voltage (V

= +3 V) Full VI 2.95 V

DD

Logic “1” Voltage (VDD = +5 V) Full IV 4.95 V
Logic “0” Voltage Full VI 0.05 V Output Coding

Offset Binary Code

POWER SUPPLY

V

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

D

VDD Supply Current (VDD = +3 V)4Full VI 4.0 6.5 5.5 6.5 7.4 8.8 mA
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°C I 15 15 15 mV/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 µA.

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 (V

6

Typical thermal impedance for the RS style (SSOP) 20-pin package: θJC = 46°C/W, θCA = 80°C/W, θJA = 126°C/W.

= +5 V ± 5%, VDD = +3 V ± 5%).

D

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 Char-

acterization Testing
V Parameter is a Typical Value Only
VI 100% Production Tested at +25°C; Guaran-

teed by Design and Characterization Testing

for Industrial Temperature Range

AIN

ENCODE

DIGITAL

OUTPUTS

N

N + 1

t

A

t

EH

N – 3 N – 2 N – 1 N N + 1 N + 2

N + 2

t

EL

N + 3

N + 4

t

V

t

PD

N + 5

REV. B

t

APERTURE DELAY

A

t

PULSE WIDTH HIGH

EH

t

PULSE WIDTH LOW

EL

t

V

OUTPUT VALID TIME

t

PD

OUTPUT PROP DELAY

Figure 1. Timing Diagram

–3–

MIN TYP MAX

2.7 ns
166 ns
166 ns

6.6 ns

4.0 ns

9.5 ns

AD9057

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

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

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

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

V

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

REF

+ 0.5 V

D

+ 0.5 V

DD

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

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

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

Maximum Junction Temperature . . . . . . . . . . . . . . . . +175°C

Maximum Case Temperature . . . . . . . . . . . . . . . . . . +150°C

ORDERING GUIDE

Temperature

Model Range Package Option*

AD9057BRS–40, –60, –80 –40° C to +85°C RS-20
AD9057/PCB +25°C Evaluation Board

*RS = Shrink Small Outline (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 Negative Full Scale 0000 0000

PIN DESCRIPTIONS

Pin No. Name 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 µF 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 kΩ 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–D4, D3–D0 Digital Outputs of ADC.
15 V

DD

Digital Output Power Supply.

Nominally +3 V to +5

V.

PIN CONFIGURATION

PWRDN

VREF OUT

VREF IN

GND

BIAS OUT

AIN

GND

ENCODE

V

D

V

D

1
2
3
4

AD9057

5

TOP VIEW

(Not to Scale)

6
7

8
9

10

20
19
18
17
16
15
14
13
12
11

D0 (LSB)
D1
D2
D3
GND
V

DD

D4
D5
D6
D7 (MSB)

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–

REV. B