ETC SHM-12

®
®
SHM-12
Ultra-Fast, 12-Bit Linear
Monolithic Sample-Hold Amplifiers
IN N O VA T IO N a n d E X C E L L E N C E
FEATURES
• Fast acquisition time:
10ns to ±0.1%
15ns to ±0.024%
20ns to ±0.012%
• ±0.006% Nonlinearity
• 65µVrms output noise
• 120MHz small signal bandwidth
• 55MHz full power bandwidth
• –80dB feedthrough
• 1ps Aperture jitter
• 250mW power dissipation
• Low cost
INPUT/OUTPUT CONNECTIONS
(CLCC and SOIC-20 Packages)
GENERAL DESCRIPTION
The SHM-12 is an extremely high-speed and accurate
monolithic sample-and-hold amplifier designed for fast data
acquisition applications. The SHM-12 is accurate (±1LSB at 12
bits over the full military temperature range) and is very fast
(10ns and 15ns acquisition times to accuracies of 10 and 12bits, respectively). With this high performance and a full power
bandwidth of 55MHz, the SHM-12 is an ideal device for driving
flash and high-resolution subranging A/D converters.
A careful design optimizes the device for accuracy and speed
over the full military temperature range. The droop rate is a low
±0.5mV/µs. The 30mA output current and guaranteed
specifications for a 100Ω load provide high drive capability.
Operating from ±5V supplies, the SHM-12 consumes only
250mW of power.
–5V SUPPLY
FUNCTION
PIN
FUNCTION
1
2
3
4
5
6
7
8
9
10
–5V SUPPLY
–5V SUPPLY
NOT CONNECTED
ANALOG INPUT
–5V SUPPLY
DO NOT CONNECT
–5V SUPPLY
DO NOT CONNECT
–5V SUPPLY
–5V SUPPLY
20
19
18
17
16
15
14
13
12
11
+5V SUPPLY
SAMPLE/HOLD
SAMPLE/HOLD
+5V SUPPLY
GROUND
EXT. CAPACITOR
GROUND
+5V SUPPLY
+5V SUPPLY
ANALOG OUTPUT
The SHM-12 is built using a fast complementary bipolar
process. The device is available in both military and industrial
temperature ranges. The SHM-12 is packaged in a 20-pin
plastic SOIC or ceramic LCC.
EXTERNAL HOLD
CAPACITOR
1, 2, 5, 7, 9, 10
ANALOG INPUT
PIN
+5V SUPPLY
15
12, 13, 17, 20
4
+1
CH
15pF
+1
11
ANALOG
OUTPUT
3
NOT CONNECTED
SAMPLE/HOLD
SAMPLE/HOLD
18
SWITCH
DRIVE
6, 8
DO NOT
CONNECT
19
14, 16
GROUND
Figure 1. SHM-12 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance (800) 233-2765
®
®
SHM-12
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
PERFORMANCE (Cont.)
LIMITS
UNITS
+5V Supply
–5V Supply
Analog Input
0 to +6
0 to –6
+5V Supply –1
–5V Supply +1
Continuous Output Current
±50
Digital Inputs
<Supply Voltages
Junction Temperature
+175
Lead Temperature (10 seconds)
+300
Output shorted to any supply will cause permanent damage.
Acquisition Time (±0.1%, ±1V)
–40 to +85°C
–55 to +125°C
Hold Mode Settling (±0.012%)
–40 to +85°C
–55 to +125°C
Hold Mode Settling (±0.024%)
–40 to +85°C
–55 to +125°C
Hold Mode Settling (±0.05%)
–40 to +85°C
–55 to +125°C
Hold Mode Settling (±0.1%)
–40 to +85°C
–55 to +125°C
Slew Rate
Full Power Bandwidth (±1V)
Small Signal Bandwidth
Output Noise, Hold Mode
Feedthrough (2V Step)
Droop Rate
+25°C
–40 to +85°C
–55 to +125°C
Volts
Volts
Volts
Volts
mA
Volts
°C
°C
FUNCTIONAL SPECIFICATIONS
(Apply over the operating temperature range using a 100Ω resistive load, 10pF
capacitive load, ECL digital input levels, a 47pF external hold capacitor, and ±5V
nominal supplies, unless otherwise specified.)
INPUTS
MIN.
TYP.
Input Voltage Range
Input Impedance
Digitals Inputs (Balanced ECL)
Logic Levels
Logic 1
Logic 0
Logic Loading
Logic 1
Logic 0
–1.5
0.3
—
1
MAX. UNITS
+1.5
—
Volts
MΩ
–1.5
–2.5
—
—
+1.8
+0.8
Volts
Volts
—
—
+10
–30
+50
–150
µA
µA
–1.5
± 30
—
—
—
—
0.3
—
+1.5
—
1
50
Volts
mA
Ω
pF
Power Supply Range
+5V Supply
–5V Supply
Power Supply Current
+5V Supply
–5V Supply
Power Dissipation
Power Supply Rejection Ratio
PERFORMANCE
Nonlinearity (±1V)
+25°C
–40 to +85°C
–55 to +125°C
Sample Mode Offset
+25°C
–40 to +85°C
–55 to +125°C
Pedestal
+25°C
–40 to +85°C
–55 to +125°C
Gain, +25°C
Gain Drift (±1V)
–40 to +85°C
–55 to +125°C
Aperture Delay
–40 to +85°C
–55 to +125°C
Aperture Jitter
–40 to +85°C
–55 to +125°C
Harmonic Distortion (±1V)
dc to 1MHz
dc to 10MHz
+25°C
–40 to +85°C
–55 to +125°C
Acquisition Time (±0.012%, ±1V)
–40 to +85°C
–55 to +125°C
Acquisition Time (±0.024%, ±1V)
–40 to +85°C
–55 to +125°C
Acquisition Time (±0.05%, ±1V)
–40 to +85°C
–55 to +125°C
TYP.
MAX. UNITS
—
—
10
10
20
20
ns
ns
—
—
10
10
—
—
ns
ns
—
—
7
7
18
18
ns
ns
—
—
6
6
15
15
ns
ns
—
—
±220
35
50
—
—
5
5
±350
55
120
65
–80
12
12
—
—
—
—
—
ns
ns
V/µs
MHz
MHz
µVrms
dB
—
—
—
±0.5
±2
±2.5
±1.5
±5
±10
mV/µs
mV/µs
mV/µs
+4.5
–5.5
+5
–5
+5.5
–4.5
Volts
Volts
+17
–17
170
40
+25
–25
250
60
+30
–30
300
—
mA
mA
mW
dB
–40
–55
–65
—
—
—
+85
+125
+150
°C
°C
°C
POWER SUPPLY REQUIREMENTS
OUTPUTS
Output Voltage Range
Output Current •
Output Impedance (dc)
Stable Capacitive Load
MIN.
ENVIRONMENTAL
—
—
—
±0.006
—
—
—
±0.024
±0.024
%
%
%
—
—
—
±12
—
—
—
±20
±30
mV
mV
mV
—
—
—
+0.98
±3
—
—
+0.995
—
±20
±20
—
mV
mV
mV
V/V
—
—
—
—
±20
±30
ppm/°C
ppm/°C
—
—
2
2
—
—
ns
ns
—
—
1
1
—
—
ps rms
ps rms
—
–75
—
dB
—
—
—
–62
—
—
—
–56
–54
dB
dB
dB
—
—
20
30
—
—
ns
ns
—
—
15
25
30
40
ns
ns
—
—
12
15
25
30
ns
ns
Operating Temp. Range, Case
SHM-12S, SHM-12L
SHM-12LM
Storage Temperature Range
Package Type
SHM-12S
SHM-12L, SHM-12LM
20-Pin plastic SOIC
20-Pin ceramic LCC
Footnotes:
• Short circuit protection at ±50mA.
TECHNICAL NOTES
The SHM-12 employs an open loop architecture to achieve its
superior high-speed characteristics. The first stage buffer
amplifier incorporates the sample-and-hold switch. This allows
for a fast acquisition time which is not limited by slew current
like the traditional Schottky diode bridge switch. The output
amplifier uses a closed loop voltage feedback design which
provides a low (0.3Ω, typical) output impedance. Gain and
linearity are not affected by heavy loads.
The design has been optimized to achieve the high accuracy
associated with fast transient responses over the military temperature range. During the track-to-hold transient, the integral
nonlinearity is not affected and the pedestal remains constant
over the full ±1.5V input range.
An innovative circuit design ensures an extremely low droop rate.
An external hold capacitor can be added to the 15pF internal
hold capacitor to obtain a lower droop rate (the droop rate is proportional to the inverse of the total hold capacitor value) without
increasing transient response times by more than a few ns. The
external hold capacitor should not exceed 100pF.
2
®
®
SHM-12
GROUNDING AND LAYOUT
Locate the bypass capacitors as close to the unit as possible.
Obtaining fully specified performance from the SHM-12 requires
careful attention to pc-board layout and power supply decoupling.
For best performance, controlled impedance transmission line
techniques, such as microstrip, should be used. Mount all components as close to the required pins as possible. It is strongly
recommended that the SHM-12 not be socket-mounted.
For optimal performance, tie all grounds directly to a large analog ground plane beneath and around the package. Bypass all
power supplies to ground with 10µF tantalum capacitors in parallel with 0.1µF ceramic capacitors.
50Ω
SHM-12
SAMPLE / HOLD
1
–5V SUPPLY
SAMPLE / HOLD
2
0.1µF
–5V SUPPLY
5
–5V SUPPLY
50Ω
7
EXTERNAL HOLD
CAPACITOR
–5V SUPPLY
GROUND
–5V SUPPLY
+5V SUPPLY
+5V SUPPLY
10µF
17
C HO LD
15
Refer to Table 1 for optional
HOLD capacitor value.
14, 16
9
0.1µF
HOLD
0.1µF
+5V SUPPLY
+5V SUPPLY
INPUT
SAMPLE
18
20
4
ANALOG
INPUT
50Ω
19
10
0.1µF
13
12
11
+
–5V SUPPLY
0.1µF
OUTPUT
Pin 3 is not connected;
do not connect pins 6 and 8.
0.1µF
ANALOG
OUTPUT
10µF
R Load
100Ω
0.1µF
+5V
–5V
Figure 2. SHM-12 Simplified Connection Diagram
-0.8 V
HOLD
SAMPLE
HOLD
-1.8 V
-0.8 V
SAMPLE
SAMPLE
HOLD
-1.8 V
+1 V
Acquisition
Time to
±0.024%
ANALOG
INPUT
-1 V
15ns typ.
+1 V
7ns typ.
ANALOG
OUTPUT
-1 V
7ns typ.
Feedthrough -80dB
Track-to-hold Settling
to ±0.024%
15ns typ.
Figure 3. SHM-12 Control and Timing
3
®
®
SHM-12
Evaluation Board
for CLCC-20 Version
0.1µF
–5V SUPPLY
16, 17, 18, 19
130Ω
SAMPLE
SHM-12
1, 2
–5V SUPPLY
0.1µF
SAMPLE / HOLD
ANALOG
INPUT
20
4
51Ω
+5V SUPPLY
INPUT
EXTERNAL HOLD
CAPACITOR
5, 7
GROUND
–5V SUPPLY
0.1µF
+5V SUPPLY
+5V SUPPLY
–5V SUPPLY
11, 12, 15
GROUND
1, 2, 3, 4
9, 10
130Ω
82Ω
19
OUTPUT
–5V SUPPLY
18
82Ω
17, 20
15
C HOLD
14, 16
CHOLD = 100pF;
Refer to Table 1.
+5V SUPPLY
0.1µF
12
11
0.1µF
GROUND PLANE
Figure 4. SHM-12 Evaluation Board Schematic
Table 1. Optional External HOLD Capacitor
SHM-12L, -12S
SHM-12LM
Operating
Temperature Range
–40 to +85°C
–55 to +125°C
4
HOLD
13
0.1µF
13
0.1µF
Model
14
SAMPLE / HOLD
Type of HOLD Capacitor
(Ceramic, ≤100pF, ±10%)
Type I or II, NPO or X7R
Type I or NPO
6, 7, 8, 9, 10
ANALOG
OUTPUT
5
®
®
SHM-12
INCHES
(mm)
0.43
(11)
PLASTIC
STANDOFF
0.13
(3.3)
0.100
(2.54)
20
19
C2
R1
18
C3
C7
C4
R4
14
R3
13
12
20
2
19
3
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
5
C6 R6
CEXT
15
1
2
C5
C1
16
1
4
17
R5
6
7
8
9
0.018
(0.45)
10
11
(TOP VIEW)
0.85
(21.59)
(BOTTOM VIEW)
0.95
(24.13)
Figure 5. SHM-12 Evaluation Board Dimensions
SHM-12 Evaluation Board Connections
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
FUNCTION
GROUND
GROUND
GROUND
GROUND
ANALOG OUTPUT
+5V SUPPLY
+5V SUPPLY
+5V SUPPLY
+5V SUPPLY
+5V SUPPLY
–5V SUPPLY
–5V SUPPLY
HOLD
SAMPLE
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
–5V SUPPLY
ANALOG INPUT
5
1.10
(27.94)
®
®
SHM-12
MECHANICAL DIMENSIONS
TOP VIEW
A
SOIC-20 Package
J
20
L
11
C
SYMBOL
A
B
C
D
E
F
G
H
J
K
L
B
K
H
1
10
E
D
G
INCHES
MIN.
MAX.
0.500
0.510
0.400
0.410
0.292
0.299
0.014
0.019
0.0500 BSC
0.0039
0.0112
0°
8°
0.020
0.040
0.097
0.104
0.010
0.020
0.0091
0.0125
MILLIMETERS
MIN.
MAX.
12.70
12.95
10.16
10.41
7.40
7.60
0.35
0.48
1.27 BSC
0.10
0.30
0°
8°
0.51
1.02
2.46
2.64
0.25
0.51
0.23
0.32
F
A
CLCC-20 Package
D
B
SYMBOL
A
B
C
D
E
F
G
H
C
E
G
PIN 1 INDEX
(H x 45°
3 PLACES)
H
INCHES
MIN.
MAX.
0.064
0.100
0.045
0.055
0.075 REF
0.342
0.358
0.022
0.028
0.020 REF
0.050 BSC
0.040 REF
MILLIMETERS
MIN.
MAX.
1.63
2.54
1.14
1.40
1.91 REF
8.69
9.09
0.56
0.71
0.51
1.27 BSC
1.02
F (F x 45°)
BOTTOM VIEW
ORDERING INFORMATION
MODEL NUMBER
PACKAGE
SHM-12S
SHM-12L
SHM-12LM
EVB-SHM12
TEMPERATURE RANGE
SOIC-20
–40 to +85°C
CLCC-20
–40 to +85°C
CLCC-20
–55 to +125°C
Evaluation Board (with SHM-12LM)
Contact DATEL for availability of high-reliability models.
®
®
IN N O VA T IO N a n d E X C E L L E N C E
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com E-mail:[email protected]
Data Sheet Fax Back: (508) 261-2857
ISO 9001
R
E
G
I
S
T
E
R
E
D
DS-0310
10/96
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.