TLV2322, TLV2322Y, TLV2324, TLV2324Y

LinCMOS

™ LOW-VOLTAGE LOW-POWER

OPERATIONAL AMPLIFIERS

SLOS187 – FEBRUARY 1997

24

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

generally measured by monitoring the distortion level of the output while increasing the frequency of a sinusoidal

input signal until the maximum frequency is found above which the output contains significant distortion. The

full-peak response is defined as the maximum output frequency, without regard to distortion, above which full

peak-to-peak output swing cannot be maintained.

Because there is no industry-wide accepted value for significant distortion, the full-peak response is specified

in this data sheet and is measured using the circuit of Figure 35. The initial setup involves the use of a sinusoidal

input to determine the maximum peak-to-peak output of the device (the amplitude of the sinusoidal wave is

increased until clipping occurs). The sinusoidal wave is then replaced with a square wave of the same

amplitude. The frequency is then increased until the maximum peak-to-peak output can no longer be maintained

(Figure 39). A square wave is used to allow a more accurate determination of the point at which the maximum

peak-to-peak output is reached.

(d) f > BOM

(d) f = BOM

(d) BOM > f > 100 Hz

(a) f = 100 Hz

Figure 39. Full-Power-Response Output Signal

test time

Inadequate test time is a frequent problem, especially when testing CMOS devices in a high-volume,

short-test-time environment. Internal capacitances are inherently higher in CMOS than in bipolar and BiFET

devices and require longer test times than their bipolar and BiFET counterparts. The problem becomes more

pronounced with reduced supply levels and lower temperatures.

APPLICATION INFORMATION

single-supply operation

While the TLV232x performs well using dual-

power supplies (also called balanced or split

supplies), the design is optimized for single-

supply operation. This includes an input common-

mode voltage range that encompasses ground as

well as an output voltage range that pulls down to

ground. The supply voltage range extends down

to 2 V, thus allowing operation with supply levels

commonly available for TTL and HCMOS.

Many single-supply applications require that a

voltage be applied to one input to establish a

reference level that is above ground. This virtual

ground can be generated using two large

resistors, but a preferred technique is to use a

virtual-ground generator such as the TLE2426 (see Figure 40). The TLE2426 supplies an accurate voltage

V

O +

V

DD

–V

I

2

R2

R1

)

V

DD

2

–

+

TLE2426

VO

VI

R1

R2

VDD

Figure 40. Inverting Amplifier With Voltage

Reference