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LTC1264-7

ELECTRICAL C

HARA TERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Group Delay (td)(fCLK /fC) = 25:1, f ≤ fCUTOFF

11.3

µs

td = (F/ 360)(1/fC);

(fCLK /fC) = 50:1, f ≤ fCUTOFF

21.6

µs

(Note 2, 3)

(fCLK /fC) = 25:1, f ≤ fCUTOFF

10.9

11.7

µs

(fCLK/fC) = 50:1, f ≤ fCUTOFF

20.8

22.9

µs

Group Delay Ripple

(fCLK /fC) = 25:1, f ≤ fCUTOFF

±1.0

(Note 2)

(fCLK/fC) = 50:1, f ≤ fCUTOFF

±1.0

(fCLK/fC) = 25:1, f ≤ fCUTOFF

±2.0

(fCLK/fC) = 50:1, f ≤ fCUTOFF

±2.0

Input Frequency Range

(fCLK/fC) = 25:1

<fCLK

kHz

(Table 9, 10)

(fCLK/fC) = 50:1

<fCLK/2

kHz

Maximum fCLK

VS = Single 5V (GND = 2V)

MHz

VS = ±5V

MHz

VS = ±7.5V

MHz

Clock Feedthrough

25:1,

±7.5V, f = fCLK

120

µVRMS

Wideband Noise

VS = Single 5V

140

± 5%

µVRMS

(1Hz

≤ f < fCLK)VS = ±5V

160

± 5%

µVRMS

VS = ±7.5V

175

± 5%

µVRMS

Input Impedance

Ω

Output DC Voltage Swing

VS = ±2.375V

±1.0

(Note 4)

VS = ±5V

±2.0

±2.3

VS = ±7.5V

±3.0

±3.8

Output DC Offset

25:1, VS = ±5V

±100

±220

(fCLK = 1MHz)

50:1, VS = ±5V

±100

±220

Output DC Offset TempCo

25:1, VS = ±5V

±200

µV/°C

50:1, VS = ±5V

±200

µV/°C

Power Supply Current

VS = ±2.375V

(fCLK = 1MHz)

VS = ±5V

VS = ±7.5V

Power Supply Range

±2.375

±8V

The q denotes specifications which apply over the full operating temperature range.

Note 1: Input frequencies, f, are linearly phase shifted through the filter as long as f

≤ fC;

fC = cutoff frequency.

Figure 1 curve (A) shows the typical phase response of an LTC1264-7 operating at

fCLK = 2.5MHz, fC = 100kHz. An endpoint straight line, curve (B), depicts the ideal linear

phase response of the filter. It is described by: phase shift = 180

° – F (f/fC); f ≤ fC.

F is arbitrarily called the “phase factor” expressed in degrees. The phase factor together

with the specified deviation from the ideal straight line allows the calculation of the phase

at a given frequency. Note, the maximum phase nonlinearity, Figure 1, occurs at the vicinity

of f = 0.25 fC and = 0.75 fC. Example: The phase shift at 70kHz of the LTC1264-7 shown in

Figure 1 is: phase shift = 180

° – 407° (70kHz/100kHz) ± nonlinearity

= –

104.9

° ± 1% or –104.9°± 1.05°.

Note 2: Group delay and group delay deviation are calculated from the measured phase

factor and phase deviation specifications.

Note 3: The filter cutoff frequency is abbreviated as fCUTOFF or fC.

Note 4: The AC swing is typically 9VP-P, 5.6VP-P, 1.8VP-P with ± 7.5V, ±5V, ±2.5V supply

respectively. For more information refer to the THD + Noise vs Input graphs.

Figure 1. Phase Response in the Passband (Note 1)

VS = ±7.5V, RL = 10k, TA = 25°C, fCUTOFF = 100kHz or 50kHz, fCLK = 2.5MHz, TTL or CMOS level (maximum clock rise or fall

time

≤ 1µs) and all gain measurements are referenced to passband gain, unless otherwise specified.

FREQUENCY (kHz)

–360

–270

–180

–90

180

LTC1264-7 F01

100

fCLK = 2.5MHz

(fCLK/fC) = 25:1

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