ELANT EL2357CN, EL2257CS, EL2257CN, EL2357CS Datasheet

EL2257C/EL2357C

125 MHz Single Supply, Clamping Op Amps

EL2257C/EL2357C

Features

• Specified for +3V, +5V, or ± 5V
Applications

• Power Down to 0 µA

• Output Voltage Clamp

• Large Input Common Mode Range
0V < V

• Output Swings to Ground Without
Saturating

• -3 dB Bandwidth = 125 MHz

• ± 0.1 dB Bandwidth = 30 MHz

• Low Supply Current = 5 mA

• Slew Rate = 275 V/µs

• Low Offset Voltage = 4 mV max

• Output Current = ±100 mA

• High Open Loop Gain = 80 dB

• Differential Gain = 0.05%

• Differential Phase = 0.05°

< VS - 1.2V

CM

Applications

• Video Amplifier

• PCMCIA Applications

•A/D Driver

•Line Driver

• Portable Computers

• High Speed Communications

• RGB Printer, FAX, Scanner
Applications

• Broadcast Equi pment

• Active Filtering

• Multiplexing

General Description

The EL2257C/EL2357C are supply op amps. Prior si ngle supply op
amps have general ly been limite d to bandwid ths and slew rates 1/4
that of the EL2257C /EL2357C. The 125 MHz b andwidth, 2 75 V/µs
slew rate, and 0.05%/0.05° differential gain/differential phase makes
this part ideal for single or dual supply video speed applications. With
its voltage feedback architecture, this amplifier can accept reactive
feedback networks, allowing them to be used in analog filtering appli­cations. The inputs can sense signals below the bo ttom supp ly rail and
as high as 1.2V below the top rail. Connecting the load resistor to
ground and operating fr om a single supply, the output s swing com­pletely to ground without saturating. The outputs can also drive to
within 1.2V of the top rail. The EL2257C/EL2357C will output
±100 mA and will operate with single supply voltages as low as 2.7V,
making them ideal for portable, low power applications.

The EL2257C/EL2357C have a high speed disable feature. Applying a
low logic level to all ENABLE pin s redu ces the supply current to 0 µA
within 50 ns. Each amplifier has its own ENABLE pin. This is useful
for both multiplexing and reducing power consumption.

The EL2257C/EL2357C also hav e an output v oltage clamp feature.
This clamp is a fast recovery (<7 ns) output clamp that pr events the
output voltage from going above the preset clamp voltage. This feature
is desirable for A/D applications, as A/D converters can require long
times to recover if overdriven.

The EL2257C/EL2357C are available in plastic DIP and SOIC pack­ages. Both parts operate over the industrial temperature range of -40°C
to +85°C. For single amplifier applications, see the
EL2150C/EL2157C. For space saving, industry standard pin out dual
and quad applications , see the EL2250C/EL2450C.

Ordering Information

Part No. Temp. Range Package Outline #

EL2257CN -40°C to +85 °C 14 Pin PDIP MDP0031 EL2257CS -40°C to +85°C 14 Pin SOIC MDP0027 EL2357CN -40°C to +85°C 16 Pin PDIP MDP0031 EL2357CS -40°C to +85°C 16 Pin SOIC MDP0027

© 1995 Elantec, Inc.

Connection Diagrams

Top View

January 5, 2000

Top View

EL2257C/EL2357C

125 MHz Single Supply, Clamping Op Amps

Absolute Maximum Ratings (T

Supply Voltage between VS and GND 12.6V
Input V oltage (IN+, IN-, EN ABLE, CLAMP) GND–0.3V, V

EL2257C/EL2357C

Differential Input Voltage ±6V
Maximum Output Current 90 mA
Output Short Circuit Duration (see note

[1]

DC Electrical Characteristics)

= 25 °C)

A

+0.3V

S

Power Dissipation See Curves
Storage Temperature Range -65°C to +150°C
Ambient Operating Temperature Range -40°C to +85°C
Operating Junction Temperature 150°C

Important Note:
All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually performed during

production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test equipment, specifically the LTX77
Series system. Unless otherwise noted, all tests are pulsed tests, therefor T

= TC = TA.

J

Test Level Test Procedure

I 100% production tested and QA sample tested per QA test plan QCX0002.

II 100% production tested at T

= 25°C and QA sample tested at TA = 25°C, T

A

MAX

and T

per QA test plan QCX0002.

MIN

III QA sample tested per QA test plan QCX0002.
IV Parameter is guaranteed (but not tested) by Design and Characterization Data.

V Parameter is typical value at T

= 25°C for information purposes only.

A

DC Electrical Characteristics

VS=+5V, GND=0V, TA=25°C, VCM=1.5V, V

Parameter Description Test Conditions Min Typ Max

V

OS

TCV

Offset Voltage EL2257C -4 4 I mV

Offset Voltage Temperature Coefficient Measured from Tmin to Tmax 10 V µV/°C

OS

IB Input Bias Current V
I

OS

TCI

Input Offset Current VIN=0V -1100 150 +1100 I nA Input Bias Current Temperature Coefficient Measured from Tmin to Tmax 50 V nA/°C

OS

PSRR Power Supply Rejection Ratio V

CMRR Common Mode Rejection Ratio VCM=0V to +3.8V 50 65 I dB

CMIR Common Mode Input Range 0 V
R
C

R
I

S,ON

I

S,OFF

IN
IN

OUT

Input Resistance Common Mode 1 2 I MΩ
Input Capacitance SOIC Package 1 V pF

Output Resistance Av=+1 40 V mΩ
Supply Current - Enabled (per amplifier) VS=V
Supply Current - Shut Down (per amplifier) VS=V

PSOR Power Supply Operating Range 2.7 12.0 I V AVOL Open Loop Gain V

OUT

=1.5V, V

CLAMP

=+5V, V

=+5V, unless otherwise specified.

ENABLE

Test

Level Units

EL2357C -6 6 I mV

=0V -5.5 -10 I µA

IN

S=VENABLE

V

CLAMP

=+2.7V to +12V,

=OPEN

45 70 I dB

VCM=0V to +3.0V 55 70 I dB

-1.2 I V

S

PDIP Package 1.5 V pF

=+12V, V

CLAMP

=+10V, V

CLAMP

V

R
V
V

=+12V, V

S=VCLAMP

=+12V, V

S=VCLAMP

=1 kΩ to GND

L

=+1.5V to +3.5V, RL=1 kΩ to GND 70 V dB

OUT

=+1.5V to +3.5V, RL=150Ω to GND 60 V dB

OUT

=+12V 5 6.5 I mA

ENABLE

=+0.5V 0 50 I µA

ENABLE

=+0.5V 5 V µA

ENABLE

=+2V to +9V,

OUT

65 80 I dB

2

EL2257C/EL2357C

125 MHz Single Supply, Clamping Op Amps

DC Electrical Characteristics (Continued)

VS=+5V, GND=0V, TA=25°C, VCM=1.5V, V

Parameter Description Test Conditions Min Typ Max

V

OP

V

ON

I

OUT

I

OUT,OFF

V

IH-EN

V

IL-EN

I

IH-EN

I

IL-EN

V

OR-CL

V

ACC-CL

I

IH-CL

I

IL-CL

Positive Output Voltage Swing VS=+12V, AV=+1, RL=1 kΩ to 0V 10.8 V V

Negative Output Voltage Swing VS=+12V, AV=+1, RL=150Ω to 0V 5.5 8 I mV

Output Current

[1]

Output Current, Disabled V
ENABLE pin Voltage for Power Up Relative to GND Pin 2.0 I V
ENABLE pin Voltage for Shut Down Relative to GND Pin 0.5 I V
ENABLE pin Input Current-High
ENABLE pin Input Current-Low
Voltage Clamp Operating Range
CLAMP Accuracy

[4]

CLAMP pin Input Current - High VS=V
CLAMP pin Input Current - Low / Per

Amplifier

1. Internal short circuit protection circuitry has been built into the EL2257C/EL2357C. See the Applications section.

2. If the disable feature is not desired, tie the ENABLE pins to the V

3. The maximum output voltage that can be clamped is limited to the maximum positive output Voltage, or V
inactivates the clamp. If the clamp feature is not desired, either tie the CLAMP pin to the V

4. The clamp accuracy is affected by V

OUT

=1.5V, V

=+5V, V

CLAMP

V

=+12V, AV=+1, RL=150Ω to 0V 9.6 10.0 I V

S

=±5V, AV=+1, RL=1 kΩ to 0V 4.0 V V

V

S

=±5V, AV=+1, RL=150Ω to 0V 3.4 3.8 I V

V

S

V

=+3V, AV=+1, RL=150Ω to 0V 1.8 1.95 I V

S

=±5V, AV=+1, RL=1 kΩ to 0V -4.0 V V

V

S

V

=±5V, AV=+1, RL=150Ω to 0V -3.7 -3.4 I V

S

=+5V, unless otherwise specified.

ENABLE

VS=±5V, AV=+1, RL=10Ω to 0V ±75 ±100 I mA

=±5V, AV=+1, RL=50Ω to 0V ±60 V mA

V

S

=+0.5V 0 20 I µA

ENABLE

[2]

[2]

[3]

and RL. See the Typical Curves Section and the Clamp Accuracy vs. VIN and RL curve.

IN

VS=V
VS=V

CLAMP
CLAMP

=+12V, V
=+12V, V

=+12V 340 410 I µA

ENABLE

=+0.5V 0 1 I µA

ENABLE

Relative to GND Pin 1.2 V
VIN=+4V, RL=1 kΩ to GND

=+1.5V and +3.5V

V

CLAMP

=+12V 12 25 I µA

CLAMP

VS=+12V, V

S

=+1.2V -30 -15 I µA

CLAMP

pin, or apply a logic high level to the ENABLE pins.

pin, or simply let the CLAMP pin float.

S

-250 100 250 I mV

. Applying a Voltage higher than VOP

OP

OP

EL2257C/EL2357C

Test

Level Units

IV

3

EL2257C/EL2357C

125 MHz Single Supply, Clamping Op Amps

Closed Loop AC Electrical Characteristics

VS=+5V, GND=0V, TA=25°C, VCM=+1.5V, V
unless otherwise specified

EL2257C/EL2357C

[1]

Parameter Description Test Conditions Min Typ Max

BW -3 dB Bandwidth (Vout=400 mVp-p) V

BW ±0.1 dB Bandwidth (Vout=400 mVp-p) V

GBWP Gain Bandwidth Product V
PM Phase Margin R
SR Slew Rate V

t

R,tF

Rise Time, Fall Time ±0.1V Step 2.8 V ns
OS Overshoot ±0.1V Step 10 V %
t

PD

t

S

Propagation Delay ±0.1V step 3.2 V ns

0.1% Settling Time VS=±5V, RL=500Ω, AV=+1, V

0.01% Settling Time V
dG Differential Gain
dP Differential Phase
e

N

i

N

t

DIS

t

EN

t

CL

Input Noise Voltage f=10 kHz 48 V nV/ÐH

Input Noise Current f=10 kHz 1.25 V pA/ÐH

Disable Time
Enable Time
Clamp Overload Recovery 7Vns

[2]

[2]

[3]

[3]

1. All AC tests are performed on a “warmed up” part, except slew rate, which is pulse tested.

2. Standard NTSC signal = 286 mVp-p, f=3.58 MHz, as V

3. Disable/Enable time is defined as the time from when the logic signal is applied to the ENABLE pin to when the supply current has reached half its
final value.

OUT

=+1.5V, V

CLAMP

=+5V, V

=+5V, AV=+1, RF=0Ω, RL=150Ω to GND pin,

ENABLE

Test

Level Units

=+5V, AV=+1, RF=0Ω 125 V MHz

S

V

=+5V, AV=-1, RF=500Ω 60 V MHz

S

V

=+5V, AV=+2, RF=500Ω 60 V MHz

S

=+5V, AV=+10, RF=500Ω 6VMHz

V

S

V

=+12V, AV=+1, RF=0Ω 150 V MHz

S

V

=+3V, AV=+1, RF=0Ω 100 V MHz

S

=+12V, AV=+1, RF=0Ω 25 V MHz

S

V

=+5V, AV=+1, RF=0Ω 30 V MHz

S

V

=+3V, AV=+1, RF=0Ω 20 V MHz

S

=+12V, @ AV=+10 60 V MHz

S

=1 kΩ, CL=6 pF 55 V °

L

=+10V, RL=150Ω, Vout=0V to +6V 200 275 I V/µs

S

=+5V, RL=150Ω, Vout=0V to +3V 300 V V/µs

V

S

=±3V 40 V ns

=±5V, RL=500Ω, AV=+1, V

S

OUT

=±3V 75 V ns

OUT

AV=+2, RF=1 kΩ 0.05 V % AV=+2, RF=1 kΩ 0.05 V °

50 V ns
25 V ns

is swept from 0.6V to 1.314V. RL is DC coupled.

IN

z

z

4

Typical Performance Curves

Non-Inverting
Frequency Response (Gain)

Inverting Frequency
Response (Gain)

125 MHz Single Supply, Clamping Op Amps

Non-Inverting
Frequency Response (Phase)

Inverting Frequency
Response (Phase)

EL2257C/EL2357C

3 dB Bandwidth vs
Temperature for
Non-Inverting Gains

3 dB Bandwidth vs
Temperature for
Inverting Gains

EL2257C/EL2357C

Frequency Response
for Various R

L

Frequency Response
for Various C

L

5

Non-Inverting
Frequency Response vs
Common Mode Voltage

EL2257C/EL2357C

125 MHz Single Supply, Clamping Op Amps

EL2257C/EL2357C

3 dB Bandwidth vs
Supply Voltage for
Non-Inverting Gains

3 dB Bandwidth vs Supply
Voltage for Inverting Gains

Frequency Response for
Various Supply Voltages,
A

= + 1

V

Frequency Response for
Various Supply Voltages,

= + 2

A

V

PSSR and CMRR
vs Frequency

PSRR and CMRR vs
Die Temperature

Open Loop Gain and
Phase vs Frequency

Open Loop Voltage Gain
vs Die Temperature

6

Closed Loop Output
Impedance vs Frequency

EL2257C/EL2357C

125 MHz Single Supply, Clamping Op Amps

EL2257C/EL2357C

Large Signal Step Response,
V

= +3V

S

Small Signal Step Response

Large Signal Step Response,
VS = +5V

Large Signal Step Response,

= ±5V

V

S

Large Signal Step Response,
VS = +12V

Slew Rate vs Temperature

Settling Time vs
Settling Accuracy

Voltage and Current Noise
vs Frequency

7