N June 1999
CLC451
Single Supply, Low-Power, High Output,
Programmable Buffer
General Description
The CLC451 is a low cost, high speed (85MHz) buffer that features user-programmable gains of +2, +1, and -1V/V. It has a new output stage that delivers high output drive current (100mA), but consumes minimal quiescent supply current (1.5mA) from a single 5V supply. Its current feedback architecture, fabricated in an advanced complementary bipolar process, maintains consistent performance over a programmable range of gains and wide signal levels, and has a linear-phase response up to one half of the -3dB frequency. The CLC451’s internal feedback network provides an excellent gain accuracy of 0.3%
The CLC451 offers superior dynamic performance with a 85MHz small-signal bandwidth, 260V/µs slew rate and 6.5ns rise/fall times (2Vstep). The combination of the small SOT23-5 package, low quiescent power, high output current drive, and high-speed performance make the CLC451 well suited for many batterypowered personal communication/computing systems.
The ability to drive low-impedance, highly capacitive loads, makes the CLC451 ideal for single ended cable applications. It also drives low impedance loads with minimum distortion. The CLC451 will drive a 100Ω load with only -78/-65dBc second/third
harmonic distortion (Av = +2, Vout = 2Vpp, f = 1MHz). With a 25Ω load, and the same conditions, it produces only -55/-60dBc sec-
ond/third harmonic distortion. It is also optimized for driving high currents into single-ended transformers and coils.
When driving the input of high-resolution A/D converters, the CLC451 provides excellent -66/-75dBc second/third harmonic
distortion (Av = +2, Vout = 2Vpp, f = 1MHz, RL = 1kΩ) and fast settling time.
Features
■100mA output current
■1.5mA supply current
■85MHz bandwidth (Av = +2)
■-66/-75dBc HD2/HD3 (1MHz)
■25ns settling to 0.05%
■260V/µs slew rate
■Stable for capacitive loads up to 1000pF
■Single 5V to ±5V supplies
■Available in Tiny SOT23-5 package
Applications
■Coaxial cable driver
■Twisted pair driver
■Transformer/Coil Driver
■High capacitive load driver
■Video line driver
■Portable/battery-powered applications
■A/D driver
Maximum Output Voltage vs. RL
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9 |
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8 |
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pp |
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(V |
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VCC = ±5V |
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Voltage |
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6 |
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5 |
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Output |
4 |
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3 |
Vs = +5V |
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2 |
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1 |
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10 |
100 |
1000 |
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RL (Ω) |
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CLC451
Buffer Programmable Output, High Power,-Low Supply, Single
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Typical Application |
Response After 10m of Cable |
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+5V |
Vin = 10MHz, 0.5Vpp |
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6.8µF |
Single Supply Cable Driver |
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+5V |
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+ |
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1 |
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100mV/div |
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5kΩ |
1kΩ |
1kΩ |
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0.1µF |
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7 |
10m of 75Ω |
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0.1µF |
2 |
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0.1µF |
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75Ω |
Coaxial Cable |
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Vo |
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Vin |
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0.1µF |
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5kΩ |
CLC451 |
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75Ω |
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4 |
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20ns/div |
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Vo |
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VCC |
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Pinout |
1kΩ |
Pinout |
1kΩ |
1kΩ |
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SOT23-5 |
+ - |
DIP & SOIC |
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VEE |
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1kΩ |
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Vnon-inv |
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Vinv |
VEE |
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© 1999 National Semiconductor Corporation |
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http://www.national.com |
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Printed in the U.S.A.
+5V Electrical Characteristics (Av = +2, RL = 100Ω, Vs = +5V1, Vcm = VEE + (Vs/2), RL tied to Vcm, unless specified)
PARAMETERS |
CONDITIONS |
TYP |
MIN/MAX RATINGS |
UNITS |
NOTES |
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Ambient Temperature |
CLC451AJ |
+25°C |
+25°C |
0 to 70°C |
-40 to 85°C |
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FREQUENCY DOMAIN RESPONSE |
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-3dB bandwidth |
Vo = 0.5Vpp |
85 |
60 |
55 |
55 |
MHz |
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Vo = 2.0Vpp |
70 |
55 |
50 |
45 |
MHz |
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-0.1dB bandwidth |
Vo = 0.5Vpp |
20 |
15 |
13 |
13 |
MHz |
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gain peaking |
<200MHz, Vo = 0.5Vpp |
0 |
0.5 |
0.9 |
1.0 |
dB |
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gain rolloff |
<30MHz, Vo = 0.5Vpp |
0.2 |
0.5 |
0.7 |
0.7 |
dB |
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linear phase deviation |
<30MHz, Vo = 0.5Vpp |
0.1 |
0.4 |
0.5 |
0.5 |
deg |
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TIME DOMAIN RESPONSE |
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rise and fall time |
2V step |
6.5 |
9.0 |
9.7 |
10.5 |
ns |
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settling time to 0.05% |
1V step |
25 |
– |
– |
– |
ns |
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overshoot |
2V step |
13 |
15 |
18 |
18 |
% |
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slew rate |
2V step |
260 |
180 |
165 |
150 |
V/µs |
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DISTORTION AND NOISE RESPONSE |
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2nd harmonic distortion |
2V , 1MHz |
-78 |
-72 |
-70 |
-70 |
dBc |
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pp |
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2Vpp, 1MHz; RL = 1kΩ |
-66 |
-60 |
-58 |
-58 |
dBc |
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3rd harmonic distortion |
2Vpp, 5MHz |
-60 |
-54 |
-52 |
-52 |
dBc |
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2V , 1MHz |
-65 |
-61 |
-59 |
-59 |
dBc |
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pp |
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2Vpp, 1MHz; RL = 1kΩ |
-75 |
-69 |
-67 |
-67 |
dBc |
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equivalent input noise |
2Vpp, 5MHz |
-52 |
-48 |
-46 |
-46 |
dBc |
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nV/√Hz |
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voltage (eni) |
>1MHz |
3.0 |
3.7 |
4 |
4 |
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non-inverting current (ibn) |
>1MHz |
6.9 |
9 |
10 |
10 |
pA/√Hz |
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inverting current (ibi) |
>1MHz |
8.5 |
11 |
12 |
12 |
pA/√Hz |
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STATIC DC PERFORMANCE |
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input offset voltage |
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8 |
30 |
37 |
37 |
mV |
A |
average drift |
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80 |
– |
– |
– |
µV/˚C |
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input bias current (non-inverting) |
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3 |
14 |
17 |
18 |
µA |
A |
average drift |
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25 |
– |
– |
– |
nA/˚C |
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gain accuracy |
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±0.3 |
±1.5 |
±2.0 |
±2.0 |
% |
A |
internal resistors (Rf, Rg) |
DC |
1000 |
±20% |
±26% |
±30% |
Ω |
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power supply rejection ratio |
49 |
46 |
44 |
44 |
dB |
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common-mode rejection ratio |
DC |
51 |
48 |
46 |
46 |
dB |
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supply current |
RL= ∞ |
1.5 |
1.7 |
1.8 |
1.8 |
mA |
A |
MISCELLANEOUS PERFORMANCE |
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MΩ |
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input resistance (non-inverting) |
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0.5 |
0.37 |
0.33 |
0.33 |
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input capacitance (non-inverting) |
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1.5 |
2.3 |
2.3 |
2.3 |
pF |
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input voltage range, High |
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4.2 |
4.1 |
4.0 |
4.0 |
V |
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input voltage range, Low |
RL = 100Ω |
0.8 |
0.9 |
1.0 |
1.0 |
V |
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output voltage range, High |
4.0 |
3.9 |
3.8 |
3.8 |
V |
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output voltage range, Low |
RL = 100Ω |
1.0 |
1.1 |
1.2 |
1.2 |
V |
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output voltage range, High |
RL = ∞ |
4.1 |
4.0 |
4.0 |
3.9 |
V |
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output voltage range, Low |
RL = ∞ |
0.9 |
1.0 |
1.0 |
1.1 |
V |
B |
output current |
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100 |
80 |
65 |
40 |
mA |
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output resistance, closed loop |
DC |
400 |
600 |
600 |
600 |
mΩ |
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Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters.
Notes
A)J-level: spec is 100% tested at +25°C.
B)The short circuit current can exceed the maximum safe output current.
1) Vs = VCC - VEE
Reliability Information
Transistor Count |
49 |
MTBF (based on limited test data) |
31Mhr |
Absolute Maximum Ratings
supply voltage (VCC - VEE) |
+14V |
output current (see note C) |
140mA |
common-mode input voltage |
VEE to VCC |
maximum junction temperature |
+150°C |
storage temperature range |
-65°C to +150°C |
lead temperature (soldering 10 sec) |
+300°C |
ESD rating (human body model) |
500V |
http://www.national.com |
2 |
±5V Electrical Characteristics (Av = +2, RL = 100Ω, VCC = ±5V, unless specified)
PARAMETERS |
CONDITIONS |
TYP |
GUARANTEED MIN/MAX |
UNITS |
NOTES |
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Ambient Temperature |
CLC451AJ |
+25°C |
+25°C |
0 to 70°C |
-40 to 85°C |
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FREQUENCY DOMAIN RESPONSE |
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-3dB bandwidth |
Vo = 1.0Vpp |
100 |
80 |
68 |
65 |
MHz |
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Vo = 4.0Vpp |
55 |
45 |
42 |
40 |
MHz |
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-0.1dB bandwidth |
Vo = 1.0Vpp |
20 |
15 |
13 |
13 |
MHz |
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gain peaking |
<200MHz, Vo = 1.0Vpp |
0 |
0.5 |
0.9 |
1.0 |
dB |
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gain rolloff |
<30MHz, Vo = 1.0Vpp |
0.2 |
0.7 |
0.8 |
0.8 |
dB |
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linear phase deviation |
<30MHz, Vo = 1.0Vpp |
0.1 |
0.3 |
0.4 |
0.4 |
deg |
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differential gain |
NTSC, RL=150Ω |
0.3 |
– |
– |
– |
% |
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differential phase |
NTSC, RL=150Ω |
0.3 |
– |
– |
– |
deg |
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TIME DOMAIN RESPONSE |
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rise and fall time |
2V step |
5.0 |
6.5 |
7.0 |
7.7 |
ns |
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settling time to 0.05% |
2V step |
20 |
– |
– |
– |
ns |
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overshoot |
2V step |
10 |
13 |
15 |
15 |
% |
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slew rate |
2V step |
350 |
260 |
240 |
220 |
V/µs |
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DISTORTION AND NOISE RESPONSE |
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2nd harmonic distortion |
2V , 1MHz |
-72 |
-66 |
-64 |
-64 |
dBc |
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pp |
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2Vpp, 1MHz; RL = 1kΩ |
-69 |
-63 |
-61 |
-61 |
dBc |
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3rd harmonic distortion |
2Vpp, 5MHz |
-66 |
-60 |
-58 |
-58 |
dBc |
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2V , 1MHz |
-65 |
-61 |
-59 |
-59 |
dBc |
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pp |
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2Vpp, 1MHz; RL = 1kΩ |
-73 |
-67 |
-65 |
-65 |
dBc |
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equivalent input noise |
2Vpp, 5MHz |
-52 |
-48 |
-46 |
-46 |
dBc |
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nV/√Hz |
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voltage (eni) |
>1MHz |
3.0 |
3.7 |
4 |
4 |
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non-inverting current (ibn) |
>1MHz |
6.9 |
9 |
10 |
10 |
pA/√Hz |
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inverting current (ibi) |
>1MHz |
8.5 |
11 |
12 |
12 |
pA/√Hz |
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STATIC DC PERFORMANCE |
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output offset voltage |
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3 |
30 |
35 |
35 |
mV |
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average drift |
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80 |
– |
– |
– |
µV/˚C |
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input bias current (non-inverting) |
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1 |
12 |
19 |
19 |
µA |
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average drift |
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40 |
– |
– |
– |
nA/˚C |
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gain accuracy |
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±0.3 |
±1.5 |
±2.0 |
±2.0 |
% |
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internal resistors (Rf, Rg) |
DC |
1000 |
±20% |
±26% |
±30% |
Ω |
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power supply rejection ratio |
48 |
45 |
43 |
43 |
dB |
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common-mode rejection ratio |
DC |
53 |
50 |
48 |
48 |
dB |
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supply current |
RL= ∞ |
1.6 |
1.9 |
2.0 |
2.0 |
mA |
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MISCELLANEOUS PERFORMANCE |
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MΩ |
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input resistance (non-inverting) |
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0.7 |
0.50 |
0.45 |
0.45 |
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input capacitance (non-inverting) |
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1.2 |
1.8 |
1.8 |
1.8 |
pF |
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common-mode input range |
RL = 100Ω |
±4.2 |
±4.1 |
±4.1 |
±4.0 |
V |
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output voltage range |
±3.8 |
±3.6 |
±3.6 |
±3.5 |
V |
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output voltage range |
RL = ∞ |
±4.0 |
±3.8 |
±3.8 |
±3.7 |
V |
B |
output current |
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130 |
100 |
80 |
50 |
mA |
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output resistance, closed loop |
DC |
400 |
600 |
600 |
600 |
mΩ |
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Notes
B)The short circuit current can exceed the maximum safe output current.
Package Thermal Resistance
Package |
θJC |
θJA |
Plastic (AJP) |
105°C/W |
155°C/W |
Surface Mount (AJE) |
95°C/W |
175°C/W |
Surface Mount (AJM5) |
140°C/W |
210°C/W |
Dice (ALC) |
25°C/W |
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Ordering Information
Model |
Temperature Range |
Description |
CLC451AJP |
-40°C to +85°C |
8-pin PDIP |
CLC451AJE |
-40°C to +85°C |
8-pin SOIC |
CLC451AJM5 |
-40°C to +85°C |
5-pin SOT |
CLC451ALC |
-40°C to +85°C |
dice |
3 |
http://www.national.com |
+5V Typical Performance (Av = +2, RL = 100Ω, Vs = +5V1, Vcm = VEE + (Vs/2), RL tied to Vcm, unless specified)
Frequency Response
Normalized Magnitude (1dB/div) |
Vo = 0.5Vpp |
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Av = 1 |
Phase |
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Av |
= -1 |
Magnitude (1dB/div) |
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Gain |
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Av = 2 |
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(deg) |
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Phase |
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Av = 1 |
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0 |
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-45 |
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Av = 2 |
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-90 |
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-135 |
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Av = -1 |
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-180 |
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-225 |
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1M |
10M |
100M |
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Frequency Response vs. RL
Vo = 0.5Vpp |
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RL = 1kΩ |
(deg) Phase |
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RL = 100Ω |
(1dB/div) |
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Gain |
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RL = 25Ω |
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Phase |
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0 |
Magnitude |
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RL = 1kΩ |
-90 |
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-180 |
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RL = 100Ω |
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-270 |
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RL = 25Ω |
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-360 |
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-450 |
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1M |
10M |
100M |
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Frequency Response vs. Vo (Av = 2) |
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Vo = 1Vpp |
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Vo = 0.1Vpp |
Vo = 2Vpp |
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Vo = 2.5Vpp |
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1M |
10M |
100M |
Frequency (Hz) |
Frequency (Hz) |
Frequency (Hz) |
Frequency Response vs. Vo (Av = +1) |
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(1dB/div) |
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Vo = 1Vpp |
Vo = 0.1Vpp |
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Vo = 2.5Vpp |
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Magnitude |
Vo = 2Vpp |
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1M |
10M |
100M |
Frequency Response vs. Vo (Av = -1) |
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(1dB/div) |
Vo = 2.5Vpp |
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Vo = 2Vpp |
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Vo = 1Vpp |
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Magnitude |
Vo = 0.1Vpp |
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1M |
10M |
100M |
Frequency Response vs. CL
(1dB/div) |
Vo = 0.5Vpp |
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CL = 10pF |
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Rs = 49.9Ω |
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CL = 100pF |
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Rs = 21Ω |
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Magnitude |
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CL = 1000pF |
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Rs = 6.7Ω |
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+ |
Rs |
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- |
CL |
1k |
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1k |
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1k |
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1M |
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10M |
100M |
Frequency (Hz) |
Frequency (Hz) |
Frequency (Hz) |
Gain Flatness
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Vo = 0.5Vpp |
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Magnitude (0.05dB/div) |
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Noise Voltage (nV/√Hz) |
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10 |
20 |
30 |
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Equivalent Input Noise |
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12 |
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2nd & 3rd Harmonic Distortion |
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4 |
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-40 |
Vo = 2Vpp |
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3rd |
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11 |
Hz)(pA/CurrentNoise√ |
(dBc)Distortion |
-50 |
RL = 100Ω |
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7 |
RL = 100Ω |
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3.5 |
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10 |
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3rd |
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-60 |
RL = 1kΩ |
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9 |
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Inverting Current 8.5pA/√Hz |
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-70 |
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2nd |
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3 |
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Voltage 3.0nV/√Hz |
8 |
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RL = 1kΩ |
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-80 |
2nd |
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Non-Inverting Current 6.9pA/√Hz |
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2.5 |
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6 |
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-90 |
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0.1k |
1k |
10k |
100k |
1M |
10M |
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1M |
10M |
Frequency (MHz) |
Frequency (Hz) |
Frequency (Hz) |
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2nd Harmonic Distortion, RL = 25Ω |
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-25 |
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-20 |
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-30 |
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(dBc) |
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(dBc) |
-30 |
-35 |
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10MHz |
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Distortion |
-40 |
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Distortion |
-40 |
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5MHz |
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-45 |
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2MHz |
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-50 |
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-50 |
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-55 |
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1MHz |
-60 |
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0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
|
3rd Harmonic Distortion, RL = 25Ω |
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|||||
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-55 |
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-60 |
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10MHz |
(dBc) |
-65 |
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5MHz |
||
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2MHz |
-70 |
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Distortion |
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|
-75 |
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-80 |
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-85 |
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1MHz |
-90 |
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0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
|
2nd Harmonic Distortion, RL = 100Ω |
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||||
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10MHz |
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5MHz |
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2MHz |
1MHz |
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0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
Output Amplitude (Vpp) |
Output Amplitude (Vpp) |
Output Amplitude (Vpp) |
|
3rd Harmonic Distortion, RL = 100Ω |
|
|
||||
|
-30 |
|
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|
-60 |
|
-35 |
|
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-40 |
|
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|
-65 |
(dBc) |
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|
10MHz |
(dBc) |
|
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|||
-45 |
|
|
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|
-70 |
||
Distortion |
-50 |
|
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|
Distortion |
|
-55 |
|
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|
5MHz |
-75 |
||
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|||
-60 |
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||
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2MHz |
|
-80 |
|
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||
|
-65 |
|
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|
-70 |
|
|
|
1MHz |
|
-85 |
|
|
|
|
|
|
||
|
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
|
2nd Harmonic Distortion, RL = 1kΩ |
|
|
||||
|
|
|
|
|
|
-50 |
|
|
|
|
|
|
-55 |
|
|
|
|
|
(dBc) |
-60 |
|
10MHz |
|
|
|
|
|
|
|
|
|
|
-65 |
|
|
|
|
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|
Distortion |
|
|
|
|
|
|
-70 |
|
|
5MHz |
|
|
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|
|
|
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|
-75 |
|
1MHz |
2MHz |
|
|
|
|
-80 |
|
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||
|
|
|
|
|
|
-85 |
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
|
3rd Harmonic Distortion, RL = 1kΩ |
|
||||
|
|
5MHz |
|
10MHz |
|
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|
2MHz |
|
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|
1MHz |
|
|
|
0 |
0.5 |
1 |
1.5 |
2 |
2.5 |
Output Amplitude (Vpp) |
Output Amplitude (Vpp) |
Output Amplitude (Vpp) |
http://www.national.com |
4 |
|
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