Analog Devices AD9050 Datasheet

+5V

10 BITS

0.1µF

0.1µF

0.1µF

ENCODE

(2)

74AC574

3

4

10

5

6

9

1, 7, 12,

21, 23

13

2, 8, 11,

20, 22

AD9050

AIN

(+3.3V ± 0.512V)

+5V

10-Bit, 40 MSPS/60 MSPS

a

FEATURES
Low Power: 315 mW @ 40 MSPS, 345 mW @ 60 MSPS
On-Chip T/H, Reference
Single +5 V Power Supply Operation
Selectable 5 V or 3 V Logic I/O
SNR: 53 dB Minimum at 10 MHz w/40 MSPS

APPLICATIONS
Medical Imaging
Instrumentation
Digital Communications
Professional Video

PRODUCT DESCRIPTION

The AD9050 is a complete 10-bit monolithic sampling analog­to-digital converter (ADC) with an onboard track-and-hold and
reference. The unit is designed for low cost, high performance
applications and requires only +5 V and an encode clock to
achieve 40 MSPS or 60 MSPS sample rates with 10-bit resolution.

The encode clock is TTL compatible and the digital outputs
are CMOS; both can operate with 5 V/3 V logic, selected by the
user. The two-step architecture used in the AD9050 is opti­mized to provide the best dynamic performance available while
maintaining low power consumption.

A 2.5 V reference is included onboard, or the user can provide
an external reference voltage for gain control or matching of
multiple devices. Fabricated on an advanced BiCMOS pro­cess, the AD9050 is packaged in space saving surface mount
packages (SOIC, SSOP) and is specified over the industrial
(–40°C to +85°C) temperature range. The 60 MSPS version
(AD9050BRS-60) is only available in the SSOP package.

AINB

AIN

ENCODE

A/D Converter

AD9050

FUNCTIONAL BLOCK DIAGRAM

GND

+5V

+5V

AD9050

T/H

TIMING

Figure 1. Typical Connections

SUM
AMP

REFERENCE CKTS

ADC

DAC

ADC

DECODE

LOGIC

10

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

AD9050–SPECIFICA TIONS

(VD, VDD = +5 V; internal reference; ENCODE = 40 MSPS for BR/BRS, 60 MSPS for BRS-60

ELECTRICAL CHARACTERISTICS

Parameter Temp Level Min Typ Max Min Typ Max Units

RESOLUTION 10 10 Bits
DC ACCURACY

Differential Nonlinearity +25°C I 0.75 1.75 0.85 1.85 LSB

Full V 1.0 1.1 LSB

Integral Nonlinearity +25°C I 1.0 1.75 1.25 2.0 LSB

Full V 1.25 1.50 LSB
No Missing Codes Full IV GUARANTEED GUARANTEED
Gain Error +25°CI ±1.0 7.5 ±1.0 8.5 % FS
Gain Tempco

ANALOG INPUT

Input Voltage Range +25°C V 1.024 1.024 V p-p
Input Offset Voltage +25°C I –10 +7 +25 –10 +7 +25 mV

Input Resistance +25°C I 3.5 5.0 6.5 3.5 5.0 6.5 kΩ
Input Capacitance +25°CV 5 5 pF
Analog Bandwidth +25°C V 100 100 MHz

BANDGAP REFERENCE

Output Voltage +25°C I 2.4 2.5 2.6 2.4 2.5 2.6 V
Temperature Coefficient

1

Full V ±100 ±100 ppm/°C

Full IV –32 +51 –32 +51 mV

1

Full V ± 50 ± 50 ppm/°C

unless otherwise noted)

Test AD9050BR/BRS AD9050BRS-60

SWITCHING PERFORMANCE

Maximum Conversion Rate +25°C I 40 60 MSPS
Minimum Conversion Rate +25°C IV 1.5 3 1.5 3 MSPS
Aperture Delay (t
Aperture Uncertainty (Jitter) +25°C V 5 5 ps, rms
Output Propagation Delay (tPD)

) +25°C V 2.7 2.7 ns

A

2

Full IV 5 15 5 15 ns

DYNAMIC PERFORMANCE

Transient Response +25°C V 10 10 ns
Overvoltage Recovery Time +25°C V 10 10 ns
ENOBS

f

= 2.3 MHz +25°C V 8.93 8.93 ENOBs

IN

f

= 10.3 MHz +25°C I 8.51 8.85 8.15 8.51 ENOBs

IN

Signal-to-Noise Ratio (SINAD)

3

fIN = 2.3 MHz +25°C V 55.5 55.5 dB
f

= 10.3 MHz +25°C I 53 55 51 53 dB

IN

Signal-to-Noise Ratio

(Without Harmonics)

f

= 2.3 MHz +25°C V 56 56 dB

IN

f

= 10.3 MHz +25°C I 53.5 55.5 51.5 54.0 dB

IN

2nd Harmonic Distortion

f

= 2.3 MHz +25°C V –69 –69 dBc

IN

f

= 10.3 MHz +25°C I –67 –60 –64 –58.5 dBc

IN

3rd Harmonic Distortion

f

= 2.3 MHz +25°C V –75 –75 dBc

IN

f

= 10.3 MHz +25°C I –70 –58 –62 –57.5 dBc

IN

Two-Tone Intermodulation

Distortion (IMD)

4

+25°C V 65 65 dBc
Differential Phase +25°C V 0.15 0.15 Degrees
Differential Gain +25°C V 0.25 0.25 %

–2–

REV. B

AD9050

Test AD9050BR/BRS AD9050BRS-60

Parameter Temp Level Min Typ Max Min Typ Max Units

ENCODE INPUT

Logic “1” Voltage Full IV 2.0 2.0 V
Logic “0” Voltage Full IV 0.8 0.8 V
Logic “1” Current Full IV 1 1 µA
Logic “0” Current Full IV 1 1 µA
Input Capacitance +25°C V 10 10 pF
Encode Pulse Width High (t
Encode Pulse Width Low (tEL) +25°C IV 10 166 6.7 166 ns

DIGITAL OUTPUTS

Logic “1” Voltage Full IV 4.95 4.95 V
Logic “0” Voltage Full IV 0.05 0.05 V
Logic “1” Voltage (3.0 V
Logic “0” Voltage (3.0 V
Output Coding Offset Binary Code Offset Binary Code

) +25°C IV 10 166 6.7 166 ns

EH

) Full IV 2.95 2.95 V

DD

) Full IV 0.05 0.05 V

DD

POWER SUPPLY

V

, VDD Supply Current

D

Power Dissipation
Power Supply Rejection Ratio

(PSRR)

NOTES

1

“Gain Tempco” is for converter only; “Temperature Coefficient” is for bandgap reference only.

2

Output propagation delay (tPD) is measured from the 50% point of the rising edge of the encode command to the midpoint of the digital outputs with 10 pF maximum
loads.

3

RMS signal to rms noise with analog input signal 0.5 dB below full scale at specified frequency for BR/BRS, 1.0 dB below full scale for BRS-60.

4

Intermodulation measured relative to either tone with analog input frequencies of 9.5 MHz and 9.9 MHz at 7 dB below full scale.

5

Power dissipation is measured at full update rate with AIN of 10.3 MHz and digital outputs loaded with 10 pF maximum. See Figure 4 for power dissipation at other
conditions.

6

Measured as the ratio of the change in offset voltage for 5% change in +VD.

Specifications subject to change without notice.

6

EXPLANATION OF TEST LEVELS

Test Level

I – 100% Production Tested.
IV – Parameter is guaranteed by design and characteriza-

tion testing.

V – Parameter is a typical value only.

5

5

Full IV 40 63 80 40 69 87.2 mA
Full IV 315 400 345 486 mW

+25°CI ±10 ±10 mV/V

ABSOLUTE MAXIMUM RATINGS*

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

ANALOG IN . . . . . . . . . . . . . . . . . . . . . . –1.0 V to V

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

V

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V

REF

+ 1.0 V

D

D
D

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

Operating Temperature

AD9050BR/BRS/BRS-60 . . . . . . . . . . . . . . .–40°C to +85°C

Storage Temperature . . . . . . . . . . . . . . . . . . .–65°C to +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 indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods may effect device reliability.

REV. B

ORDERING GUIDE

Model Temperature Range Package Option*

AD9050BR –40°C to +85°C R-28
AD9050BRS –40°C to +85°C RS-28
AD9050BRS-60 – 40°C to +85°C RS-28

*R = Small Outline (SO); RS = Shrink Small Outline (SSOP).

–3–

AD9050

WARNING!

ESD SENSITIVE DEVICE

Table I. AD9050 Digital Coding (Single Ended Input AIN, AINB Bypassed to GND)

OR Digital Output

Analog Input Voltage Level (Out of Range) MSB . . . LSB

3.813 Positive Full Scale + 1 LSB 1 1111111111

3.300 Midscale 0 0111111111

2.787 Negative Full Scale – 1 LSB 1 0000000000

PIN FUNCTION DESCRIPTIONS

Pin No Name Function

1, 7, 12, 21, 23 GND Ground.
2, 8, 11 V
3VREF
4 VREF

D

OUT
IN

5 COMP Internal compensation pin, 0.1 µF bypass connected here to V
6 REF

BP

9 AINB Complementary analog input pin (Analog input bar).
10 AIN Analog input pin.
13 ENCODE Encode clock input to ADC. Internal T/H is placed in hold mode (ADC is encoding)

14 OR Out of range signal. Logic “0” when analog input is in nominal range. Logic “1” when
15 D9 (MSB) Most significant bit of ADC output.

16–19 D8–D5 Digital output bits of ADC.
20, 22 V

DD

24–27 D4–D1 Digital output bits of ADC.
28 D0 (LSB) Least significant bit of ADC output.

Analog +5 V ± 5% power supply.
Internal bandgap voltage reference (nominally +2.5 V).
Input to reference amplifier. Voltage reference for ADC is connected here.

(+5 V).

D

External connection for (0.1 µF) reference bypass capacitor.

on rising edge of encode signal.
analog input is out of nominal range.

Digital output power supply (only used by digital outputs).

PIN CONFIGURATION

GND

1

V

2

D

VREF

3

OUT

VREF

4

IN

5
6

REF

BP

GND

AINB

GND

ENCODE

AD9050

7

TOP VIEW

8

V

(Not to Scale)

D

9

AIN D5

10
11

V

D

12
13

OR

14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

D0 (LSB)
D1
D2
D3
D4COMP
GND
V

DD

GND
V

DD

D6
D7
D8
D9 (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 AD9050 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