ETC DEM-OPA660-1GC

DEM-OPA660-1GC
EVALUATION FIXTURE
®
FEATURES
DESCRIPTION
● EASY AND FAST PERFORMANCE TESTING
The demo fixture DEM-OPA660-1GC allows easy and
fast performance testing of the OPA660AP building
blocks OTA and buffer stage. Figure 1 shows a diagram
of the test fixture, and Figures 2, 3 and 4 show the
frequency responses of the OTA stage measured at
gains 1, 2, and 10 with various output levels from
0.2Vp-p to 5Vp-p.
● SHOWS OPTIMIZED BOARD LAYOUT
● REPLACES SELF-MADE BOARDS
APPLICATIONS
Figure 5 illustrates the frequency response of the buffer
stage. The silk-screen and the double-sided layout can
be seen in Figure 6.
● COMPONENTS INCOME CONTROL
● PERFORMANCE CHECKS
● CIRCUIT DESIGNS
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage
±6V
Input Voltage
±VCC, ±0.7V
Operating Temperature
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (602) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
© 1991 Burr-Brown Corporation
–40°C to +85°C
Current Output
±15mA
Quiescent Current
±26mA
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (602) 889-1510 • Immediate Product Info: (800) 548-6132
LI-407
Printed in U.S.A. October, 1991
R5
5
BUF In
6
1
R6
BUF Out
R7
+5V
–5V
R2
1
OTA Out
R1
OTA In
8
R3
3
2
C1
C2
R4
470p
470p
10n
10n
2.2µ
2.2µ
Rqc
IN4007
7
4
FIGURE 1. Block Diagram of Test Fixture.
20
20
15
10
2.8Vp–p
5
1.4Vp–p
0
Output Voltage (Vp-p)
Output Voltage (Vp-p)
15
0.6Vp–p
–5
–10
0.2Vp–p
–15
10
2.8Vp–p
5
1.4Vp–p
0
0.6Vp–p
–5
–10
0.2Vp–p
–15
–20
–20
–25
–25
dB
dB
1M
10M
100M
1M
1G
10M
1G
IQ = 20mA, R1 = 100Ω, R4 = 51Ω, RA = 100Ω, Gain = 2
IQ = 20mA, R1 = 100Ω, R4 = 51Ω, RA = 50Ω, Gain = 1
FIGURE 2. OTA Frequency Response, G = 1.
FIGURE 3. OTA Frequency Response, G = 2.
20
20
15
5Vp–p
15
10
2.8Vp–p
10
5
1.4Vp–p
0
Output Voltage (Vp-p)
Output Voltage (Vp-p)
100M
Frequency (Hz)
Frequency (Hz)
0.6Vp–p
–5
–10
0.2Vp–p
–15
–20
5
0
2.8Vp–p
1.4Vp–p
0.6Vp–p
–5
–10
0.2Vp–p
–15
–20
–25
–25
dB
dB
1M
10M
100M
1G
1M
10M
100M
Frequency (Hz)
Frequency (Hz)
IQ = 20mA, R1 = 100Ω, R4 = 51Ω, RA = 500Ω, Gain = 10
IQ = 20mA, R5 = 160Ω, RA = 100Ω
FIGURE 4. OTA Frequency Response, G = 10.
FIGURE 5. BUF Frequency Response.
®
DEM-OPA660-1GC
2
1G
-1GC
FIGURE 6. Silk Screen and Board Layouts.
Test Circuit OPA660-1GC OTA
R1
50Ω
8
3
Network Analyzer
R2
Out
DT
R3
50Ω
In
• • •
2
50Ω
Generator
R4
Ra = R2 + R3 || 50Ω
Test Circuit OPA660-1GC BUF
R5
50Ω
In
R6
5
DB
Network Analyzer
Out
6
R7
50Ω
50Ω
• • •
Generator
Ra = R6 + R7 || 50Ω
FIGURE 7. Test Configuration for Frequency Response Measurements.
ORDERING INFORMATION
MODEL
DEM-OPA660-1GC
DESCRIPTION
TEMPERATURE RANGE
Diamond Transistor
and Buffer
–25°C to +85°C
®
3
DEM-OPA660-1GC