LTC1060CSW datasheet(9/20 Pages) LINER

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LTC1060

1060fb

Table 2. Wideband RMS Noise

fCLK

NOTCH/HP

(µVRMS)(µVRMS)(µVRMS)

CONDITIONS

±5V

50:1

49 (42)

52 (43)

75 (65)

Mode1, R1 = R2 = R3

±5V

100:1

70 (55)

80 (58)

90 (88)

Q = 1

±2.5V

50:1

33 (31)

36 (32)

48 (43)

±2.5V

100:1

48 (40)

52 (40)

66 (55)

±5V

50:1

20 (18)

150 (125)

186 (155)

Mode 1, Q = 10

±5V

100:1

25 (21)

220 (160)

240 (180)

R1 = R3 for BP out

±2.5V

50:1

16 (15)

100 (80)

106 (87)

R1 = R2 for LP out

±2.5V

100.1

20 (17)

150 (105)

150 (119)

±5V

50:1

Mode 3, R1 = R2 = R3 = R4

±5V

100:1

Q = 1

±2.5V

50:1

±2.5V

100.1

±5V

50:1

135

120

140

Mode 3, R2 = R4, Q = 10

±5V

100:1

170

160

185

R3 = R1 for BP out

±2.5V

50:1

100

R4 = R1 for LP and HP out

±2.5V

100:1

125

115

130

Short-Circuit Currents

Short circuits to ground, positive or negative power supply

are allowed as long as the power supplies do not exceed

±5V and the ambient temperature stays below 85˚C.

Above ±5V and at elevated temperatures, continuous

short circuits to the negative power supply will cause

excessive currents to flow. Under these conditions, the

device will get damaged if the short-circuit current is

allowed to exceed 80mA.

Each building block of the LTC1060, together with an

external clock and a few resistors, closely approximates

2nd order filter functions. These are tabulated below in the

frequency domain.

1. Bandpass function: available at the bandpass output

Pins 2 (19). (Figure 1.)

G(s) = HOBP

sωo/Q

s2 + (sωo/Q) + ωo2

HOBP = Gain at ω = ωo

f0 = ω/2π; f0 is the center frequency of the complex

pole pair. At this frequency, the phase shift

between input and output is –180˚.

Q = Quality factor of the complex pole pair. It is the

ratio of f0 to the –3dB bandwidth of the 2nd or-

der bandpass function. The Q is always mea-

sured at the filter BP output.

2. Lowpass function: available at the LP output Pins

1 (20). (Figure 2.)

G(s) = HOLP

ωo

s2 + s(ωo/Q) + ωo

HOLP DC gain of the LP output.

APPLICATIO S I FOR ATIO

DEFINITION OF FILTER FUNCTIONS

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